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單項(xiàng)選擇題

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

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