1、 ( ) 1 (2016 )( ) M N K K M N pM pN K M N pM pN ( AD ) A pM pN B pMpN C pM pN D pM pN ,( 1 ) ,( 2 ) 2 (2016 )2016 4 20 ( A ) A B C D 3 (2016 ) ( B ) A B C D 4 (2016 ) ( C ) A B C D 5 (2016 ) ( A ) A B C D 6 2014 ( A ) A. B. C. D. 7 (2016 ) ( A ) A B C D 8 (2016 ) ( C ) A B C D 1971 6 30 9 (2016 ) (
2、D ) A B C D 10 (2016 ) _ _ _ _ _ _ 11 ( ) F D r D 2 S D 2 4 p F S 4F D 2 12 (2016 A ) A B 20cm 30cm A B 3 1 A B A A 5100Pa( ) (1) A (2) A (3) B A B ( ) B 2800Pa B (1)F pS 204N (2) F GA GB Aga 3 Bgb 3 A B A 3 kg/m 3 B 3 kg/m 3 (3)GA Aga 3 96N GB Bgb 3 108N B x GA GB x p b 2 x x 2 3 1 2 3 1 3 13 (2015 ) (1) _ _ (2) _ _ (3) _ _( _ _