单项选择题
A.to revolve B.revolved C.revolving D.to be revolved
The piston moves up and down, thus causing the rotation...
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
The piston cooling system may employ similar components...
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
单项选择题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
