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

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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

单项选择题

In the shafting management （） should be paid more attention.
Ⅰ.f the while metal tailshaft bearing is dripping oil
Ⅱ.f some area become blue during the running
Ⅲ.he deformation of crankshaft

A.Ⅰ
B.Ⅱ
C.Ⅲ
D.Ⅱ+Ⅲ

单项选择题

The bearing of tailshaft sealing equipment, which adopting the oil nature circulation is hot, the reason is（）

A.the rotate speed fluctuation
B.the ventilation tube clogged
C.the main engine accelerate so fast
D.stormy waves