單項(xiàng)選擇題The piston moves up and down, thus causing the rotational movement of the（）

A.crankshaft
B.connecting rod
C.cross-head
D.main beating


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1.單項(xiàng)選擇題The piston cooling system may employ similar components, except that a drain tank is used instead of a head tank That means this system （）.

A.doesnt use a drain tank but a head tank
B.uses a drain tank not head tank
C.uses a drain tank and a head tank
D.uses neither a drain tank nor a head tank

2.單項(xiàng)選擇題The piston cooling system may employ similar components, except that （） is used instead of a head tank.

A.a sump tank
B.a feed well
C.a double bottom tank
D.a drain tank

3.單項(xiàng)選擇題The pistons are cooled by oil supplied from the forced （） system.

A.fresh water
B.sea water
C.lubrication
D.fuel oil

4.單項(xiàng)選擇題The period when both inlet valves and exhaust valves are open is referred to as （）.

A.valve loop
B.valve uniflow
C.valve overlap
D.valve grinding

5.單項(xiàng)選擇題The period of valve overlap is when （）.

A.the inlet valve is open
B.the exhaust valve is open
C.both valves are close
D.both valves are open