1、 2017 2018 A 10 20 1 2 3 4 5 6 7 8 9 10 C B C A B C D B D C 7 28 4 2 0 11 12 13 14 15 16 17 AB BCD BC BC ACD AD BC 1 5 18 5 1 2 3 4 B 1 2 1 5 4 23 19 1 2 3 4 1 4 20 1 2 4 J 3 3 J/ . 1 4 21 1 6 2 3 1 6 22 1 2 R 3 4 C 3 5 A 6 1 2 1 9 4 24 23 Q cm t0 t t t0 Q cm 800 3o 717.6J 0.46 10 J/ kg C 0.002kg 20
2、 4 24 1 a R2 U2 U 6V 1 2 2 2 6V 6 1.0A U R I 1 2 b R1 R2 R1 U1 U U2 6V 2V 4V 1 I1 I2 2 2 2V 1 A 63 U R 1 R1 1 1 4V 12 1 A 3 U I 1 25 1 m 3 kg/m 3 -3 m 3 1 Q cm(t t0) 3 6 2 2 Q qV 7 J/m 3 2316.10m 3 2315.93 m 3 6 2 3 Q Q 6 0 0 6 4.2 10 J 100 5.95 10 J 2 26 1 S1 S2 R2 R3 1 1 I I2 2 2 U R 9V 6 2 R R3+R2 1 U I R 1 2 S1 S2 R3 R1 R2 2 2 U1 U2 U 2 12 1 1 1 = R R R 1 1 5 += 4 6 12 R 12 =2.4 5 1 I U R 15V 2.4 1
