单项选择题

The crank throws are displaced from （） to obtained the same number of degrees between the different crank throws.

A.one another
B.the other
C.each other
D.each others

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单项选择题

A.lubrication
B.cooling
C.balancing purpose
D.ventilation

单项选择题

A.can be recovered
B.is only supplied to cylinders
C.only feeds the main bearing
D.is a kind of detergent

单项选择题

A.pressure gauges
B.stretch gauges
C.thermometers
D.bridge gauges