單項(xiàng)選擇題Each crank is made up of two crank webs joined by a common() to which the bottom endbearing is fitted.

A.throw
B.crankshaft
C.crankpin
D.crosshead


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2.單項(xiàng)選擇題During the suction stroke, the piston is moving ().

A.inwards
B.outwards
C.downwards
D.upwards

3.單項(xiàng)選擇題During the inspection, the starting air valves should be closed () the engine from turning.

A.to increase
B.to speed up
C.to prevent
D.to reduce

4.單項(xiàng)選擇題During repair,lubrication lines and orifices must be ().

A.taken away
B.engaged
C.connected
D.sealed off

5.單項(xiàng)選擇題During (), the starting air valves should be closed to prevent the engine from turning.

A.overhaul
B.running
C.blowing down
D.All of the above are correct