20. Compression was obtained within all cylinders as the engine's ________ was rotated.
(A) turbo-charger
(B) crankshaft
(C) lubricating pump
(D) balancer

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統計： A(176), B(536), C(94), D(19), E(0) #1359048

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20.當發動機的____旋轉時，對所有氣...
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