电磁流量变送器中切割磁力线的导体是（）
A、流动液柱
B、金属导体
C、有一定的电导率固体
D、磁性材料
参考答案：A
The party was meant to be a surprise to everyone who would take part, but one of the
organizers____ the plan. [ ]
A. gave away
B. gave out
C. gave up
D. gave back
全列车的空调温度在（）内进行调节。
A.激活端司机室的IDU
B.乘务室的IDU
C.未激活端的司机室内的IDU
D.餐车控制柜
