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[单选题]Increasing differential pressure of an oil filter indicates that ()
A. it is dirty
B. it is leaky
C. it has been renewed
D. all the above
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学习资料:
[单选题]废气锅炉烟道温度在1100℃以上时可能发生()。
A. 小的烟垢着火
B. 锅炉爆炸
C. 铸铁着火
D. 氢着火
[单选题]In a general oil cooler circulated by sea water, the oil is at a higher pressure, the result being that any leak in the cooler will mean a loss of ().
A. oil
B. sea water
C. air
D. fresh water
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