单项选择题
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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相关考题
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单项选择题
The piston moving up and down keeps the crankshaft （）.
A.to revolve
B.revolved
C.revolving
D.to be revolved -
单项选择题
The piston moves up and down, thus causing the rotational movement of the（）
A.crankshaft
B.connecting rod
C.cross-head
D.main beating -
单项选择题
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
