If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a （）<br>A:loss of suction in the circulating pump<br>B:leak in the primary cooling system<br>C:broken raw water pump shaft<br>D:burned or cracked piston in one cylinder

If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a （）
A:loss of suction in the circulating pump
B:leak in the primary cooling system
C:broken raw water pump shaft
D:burned or cracked piston in one cylinder

出自：海船船员证

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