單項(xiàng)選擇題

Some refrigeration systems have chemical moisture indicators installed in conjunction with the sight glass in the liquid lineIf excess moisture is present in the system, the indicator will （）

A.activate the driers
B.change color
C.secure the compressor
D.add a predetermined amount of liquid drier

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In the navigation, cause the shafting over load most easily（）

A.stopping the main engine suddenly
B.changing the main engine running direction suddenly
C.the sailing from the shallow water area to the deep water area
D.the ship’s trim too much

單項(xiàng)選擇題

The oil index of main engine should be controlled to prevent it from in heavy weather（）

A.over heat
B.over speed
C.over pressure
D.over worn