1、Leaders: provincial agricultural work Conference held in XX, which is our concern and love, will greatly promote XX agricultural and rural economic development. First of all, I am representing XX municipal party Committee and Government, extend a warm welcome to the attending leaders! XX has been gi
2、ven support and assistance to the province of agriculture, provincial agricultural Office, and expressed heartfelt thanks to all the friends! below, I XX with a brief report. A basic XX of XX municipality located (cities, omitted). One is the superior ecological environment. XX blue, clear, green, w
3、ater, air, 70% of land in the territory is covered with forests, grasslands, wetlands and waters, built 7 thousands of square kilometers of the total area of nature reserves. Within major industrial pollution sources, air quality at the national level, national levels, water quality, soil pollution,
4、 “pure land“ reputation, was heralded by the United Nations environmental officials “the most suitable place for human survival.“ Second, the enrichment of natural resources. A total area of more than 5 million mu of arable land (which owned 1.53 million acres), the annual grain output of more than
5、2 million tons and is located in the internationally recognized gold “cattle“, there should be more than 400,000 acres of grazing grassland, developing animal husbandry conditions; a total area of 4.1 million acres of forest land, rich in precious wood such as pine, ash, yellow pineapple, standing t
6、imber volume of more than 26 million cubic meters. Forest Xia has hundreds of species precious wildlife, more than 200 more species precious herbs, annual Super thousand tons of wild mushroom and reserves Super 100,000 tons of mountain dish; nectar plant throughout, can bee 100,000 group, is China “
7、bee of Xiang“, and national Northeast black bee reserves and important of bee products production base; can using water 2.5 billion cubic metres, should be fishing water 460,000 acres, rich big salmon, and “three spent five Luo“, North cold water specialty fish; found and proved reserves of mineral
8、resources has 36 species. Third, geopolitical advantages. XX open midpoint is located in the eastern part of the province along the border, 264 km long border, with national road passenger and freight transport port, built on the border between China and Russia has the largest permanent boundary Riv
9、er Bridge, running at full capacity the annual cargo capacity of up to 2.6 million tons. Russia two (HABA and Marina), two cities (Iman and Lesozavodsk) is the Russian Far East in developed areas. Lesozavodsk is only 8 km from XX port corresponding to the port of markovo, Lu Rinuo station is one of
10、three railway marshalling yards in the far East, the far East-Siberian railway and a parallel road runs through the pass. By rail and road, to the North by HABA capital Khabarovsk, the Russian hinterland, radiation in the CIS and Eastern European countries; to the South through the port of Vladivost
11、ok and the nahuo card on the sea, to reach South Korea, Japan and other Pacific Rim countries and regions. Four is rich in tourism resources. XX tourist resources types, many attractions, beautiful scenery of the Sino-Russian border-river-wusuli River, a famous treasure island, known as the “Orienta
12、l Maginot line“ of the Japanese invading army Tiger underground fortress ruins, General Chi全国 2010 年 7 月自学考试机械设计基础试题课程代码：02185一、单项选择题(本大题共 20 小题，每小题 2 分，共 40 分)在每小题列出的四个备选项中只有一个是符合题目要求的，请将其代码填写在题后的括号内。错选、多选或未选均无分。1.若两构件组成高副，则其接触形式为( )A.面接触 B.点或线接触C.点或面接触 D.线或面接触2.曲柄摇杆机构中，当曲柄为主动件时，最小传动角发生在( )A.从动件与连杆
13、共线位置 B.从动件与机架共线位置C.主动件与连杆共线位置 D.主动件与机架共线位置3.当凸轮机构的从动件选用余弦加速度运动规律时，在一般情况下，其从动件的运动( )A.将产生刚性冲击 B.将产生柔性冲击C.没有冲击 D.既有刚性冲击，又有柔性冲击4.拨盘与槽轮的转向相反，并且拨盘转动一周，槽轮转动两次的槽轮机构是( )A.单圆销外啮合槽轮机构 B.双圆销外啮合槽轮机构C.多圆销外啮合槽轮机构 D.内啮合槽轮机构5.螺纹联接防松的实质是( )A.增加螺纹联接的轴向力 B.增加螺纹联接的横向力C.防止螺纹副发生相对转动 D.增加螺纹联接的刚度6.普通平键长度的主要选择依据是( )A.传递转矩的大
14、小 B.传递功率的大小C.轴的直径 D.轮毂的宽度7.在带传动工作时，产生打滑的条件是( )A.有效拉力 F摩擦力总和的极限值 FlimB.紧边拉力 F1摩擦力总和的极限值 FlimC.紧边拉力 F1e 时，X=0.4，Y=1.6。试画出内部轴向力 Fs1、F s2 的方向，并计算轴承的当量动载荷 P1、P 2。Leaders: provincial agricultural work Conference held in XX, which is our concern and love, will greatly promote XX agricultural and rural econ
15、omic development. First of all, I am representing XX municipal party Committee and Government, extend a warm welcome to the attending leaders! XX has been given support and assistance to the province of agriculture, provincial agricultural Office, and expressed heartfelt thanks to all the friends! b
16、elow, I XX with a brief report. A basic XX of XX municipality located (cities, omitted). One is the superior ecological environment. XX blue, clear, green, water, air, 70% of land in the territory is covered with forests, grasslands, wetlands and waters, built 7 thousands of square kilometers of the
17、 total area of nature reserves. Within major industrial pollution sources, air quality at the national level, national levels, water quality, soil pollution, “pure land“ reputation, was heralded by the United Nations environmental officials “the most suitable place for human survival.“ Second, the e
18、nrichment of natural resources. A total area of more than 5 million mu of arable land (which owned 1.53 million acres), the annual grain output of more than 2 million tons and is located in the internationally recognized gold “cattle“, there should be more than 400,000 acres of grazing grassland, de
19、veloping animal husbandry conditions; a total area of 4.1 million acres of forest land, rich in precious wood such as pine, ash, yellow pineapple, standing timber volume of more than 26 million cubic meters. Forest Xia has hundreds of species precious wildlife, more than 200 more species precious he
20、rbs, annual Super thousand tons of wild mushroom and reserves Super 100,000 tons of mountain dish; nectar plant throughout, can bee 100,000 group, is China “bee of Xiang“, and national Northeast black bee reserves and important of bee products production base; can using water 2.5 billion cubic metre
21、s, should be fishing water 460,000 acres, rich big salmon, and “three spent five Luo“, North cold water specialty fish; found and proved reserves of mineral resources has 36 species. Third, geopolitical advantages. XX open midpoint is located in the eastern part of the province along the border, 264
22、 km long border, with national road passenger and freight transport port, built on the border between China and Russia has the largest permanent boundary River Bridge, running at full capacity the annual cargo capacity of up to 2.6 million tons. Russia two (HABA and Marina), two cities (Iman and Les
23、ozavodsk) is the Russian Far East in developed areas. Lesozavodsk is only 8 km from XX port corresponding to the port of markovo, Lu Rinuo station is one of three railway marshalling yards in the far East, the far East-Siberian railway and a parallel road runs through the pass. By rail and road, to
24、the North by HABA capital Khabarovsk, the Russian hinterland, radiation in the CIS and Eastern European countries; to the South through the port of Vladivostok and the nahuo card on the sea, to reach South Korea, Japan and other Pacific Rim countries and regions. Four is rich in tourism resources. XX tourist resources types, many attractions, beautiful scenery of the Sino-Russian border-river-wusuli River, a famous treasure island, known as the “Oriental Maginot line“ of the Japanese invading army Tiger underground fortress ruins, General Chi6
