单项选择题
If the jacket water temperature of an operating diesel engine suddenly rises above normal, the cause can be attributed to （）.
A.an overfilled expansion tank
B.excess chromate treatment of the jacket water
C.a clogged raw water sea suction
D.cavitation erosion of the heat exchanger tubes
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A.an isochronous governor
B.elastic engine mounts
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A.(1) only is correct
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