2018 2017 1 B 2 D 3 B 4 B 5 D 6 C 7 A 8 B 9 AC 10 AC 11 12 13 14 15 16 15 15 60 17 2.1 10 3 J/(kg ) 1kg B 1 2.1 10 3 J 18 19 3 20 B 96 99 A 21 A 22 Q cm t 0.88 10 3 J/(kg ) 8kg (120 20 ) 0.704 10 6 J 4 Q m q 0.4kg 3 10 7 J/kg 1.2 10 7 J 4 22 Q cm t 4.2 10 3 J/(kg ) 2kg (100 20 ) 3 6.72 10 5 J Q qv 8.4 10 7 J/m 3 0.02m 3 1.68 10 6 J 3 % 40 % 100 10 68 . 1 10 72 . 6 % 100 6 5 J J Q Q 3
