题目内容

采掘工作面的空气温度超过()℃时,必须停止作业

A. 28
B. 29
C. 30
D. 31

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Which of the following are true regarding bridges and switches?()

A. Bridges are faster than switches because they have fewer ports.
B. A switch is a multiport bridge.
C. Bridges and switches learn MAC addresses by examining the source MAC address of each frame received.
D. A bridge will forward a broadcast but a switch will not.
E. Bridges and switches increase the size of a collision domain.

老绿篱更新时将地上部分全部锯掉的方法称为()。

A. 平茬
B. 台刈
C. 疏干
D疏枝

每船应具有抛绳设备的抛射火箭和抛射药筒()支。

A. 1
B. 2
C. 4

翻车机司机可以不按信号显示步骤来完成翻车程序。

A. 正确
B. 错误

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