單項(xiàng)選擇題The crankshaft deflection is at first to be () before and after repair.

A.disassembled
B.renewed
C.measured
D.regulated


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3.單項(xiàng)選擇題The crankcase cover should never be allowed to open for investigation when ()

A.the engine stops
B.the engine is running
C.you repair the engine
D.overhauling the engine

4.單項(xiàng)選擇題The crankcase can not be opened ()the parts have been cooled down.

A.if
B.as
C.unless
D.when

5.單項(xiàng)選擇題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