问题描述：
[单选]
If over a period of weeks the air-box pressure of a turbo-charged， diesel engine， operating at full load， appears to be dropping off， the cause can be（）．
A．open air-box drains
B．loss of cooling water to the diffuser
C．gradual fouling of the air filters
D．improperly timed exhaust valve
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上一篇：Before an auxiliary boiler is shutdown for an extended period of time， the water in the boiler should have a pH value of（）．
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