單項選擇題The piston ring grooves for a standard engine are ()

A.chromium-plate against wear
B.anti-corrosion treated
C.white metal lined against wear
D.flame hardened against wear


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1.單項選擇題The piston moving up and down keeps the crankshaft ().

A.to revolve
B.revolved
C.revolving
D.to be revolved

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

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

3.單項選擇題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

4.單項選擇題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

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

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