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

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


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2.單項(xiàng)選擇題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

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題The tailshaft sealing arrangement found a little lube oil leaky and caused a lot of seawater into the bearing, the step should be taken as a makeshift is（）

A.dropping lube oil for lubrication, reducing the pollution to the sea
B.setting a temporary gravity oil tank and enhanced the position properly
C.lubricating with the used lube oil
D.lubricating with the fresh water and navigation in a lower speed