热继电器的连接导线太粗会使热继电器出现（）。
A、误动作；
B、不动作；
C、热元件烧坏；
D、控制电路不通。
参考答案：B
---It is reported that a Boeing 777-200 plane became lost in communication (失去联系) at midnight __________ the early morning of March 8th．
---I was amazed to hear that.
A．at
B．in
C．on
D．of
合理的社会流动
