客车集便系统中的便器因破损影响使用为（）类故障。
A.A
B.B
C.C
D.D
参考答案：C
电感量一定的线圈，产生自感电动势大，说明该线圈中通过电流的（）。
A.数值大
B.数值小
C.变化率大
D.变化率小
The people in Taiwan consume______milk per person today as they did twenty years ago.
A．more than twice as many
B．twice more than as much
C．so much more than twice
D．more than twice as much
