單項(xiàng)選擇題() clearances in the main or crank pin bearings will sometimes be indicated by loss of pressure in the lubricating system before any bearing knock is heard.

A.Too larger
B.Too smaller
C.Excess
D.Excessive


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1.單項(xiàng)選擇題() supplies pilot air to control the cylinder air start valves.

A.An air compressor
B.An indicator cock
C.An air distributor
D.A safety valve

2.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

3.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

4.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