单项选择题

The air-conditioner is running in the winter and to be stopped, we should（）

A.close Fan and Humidifier at the same time
B.firstly close Fan and then close humidifier immediately
C.firstly close humidifier and then close Fan immediately
D.firstly close humidifier and then close Fan after 30 seconds

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单项选择题

The humidifier’s valve of air-condition should be （）, when the temperature is lower than 0℃.

A.decreased
B.increased
C.fixed
D.closed

单项选择题

The humidifier’s valve of air-conditioner should be （）, when the temperature is 5~8°C in the winter.

A.decreased
B.increased
C.fixed
D.closed

单项选择题

In the management of the shafting, because（） carry heavy load and caused high temperature easily, it should be paid attention.

A.the bearing near to the diesel engine
B.the intermediate bearing near to the thrust bearing
C.the intermediate bearing near to the sterntube
D.the bearing located at the middle of the diesel engine and the sterntube