單項(xiàng)選擇題() may have two emergency source of power, thus requiring two emergency switchboards.

A.Large passenger vessels
B.General cargo ships
C.Container ships
D.Oil tankers


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1.單項(xiàng)選擇題() usually helps to induce air movement to assist combustion.

A.Cylinder cover
B.Main bearing
C.The exhaust valve
D.The piston movement

2.單項(xiàng)選擇題() is secured by means of side-chock bolts and end-chock bolts.

A.The bedplate
B.The column
C.The main bearing
D.The double bottom

4.單項(xiàng)選擇題() for the camshaft gear train is taken from a spur gear which for a six cylinder engine is at the coupling end.

A.The driven gear
B.The drive
C.The grease
D.The lubricating oil

5.單項(xiàng)選擇題() water is more expensive than fresh water It has high specific heat and low viscosity.

A.Distilled
B.Distilling
C.Boiling
D.Boiled