题目内容
（请给出正确答案）
Which of the following statements concerning fire-tube boilers is correct？ .
A.Combustion gases flow through the tubes
B.Flames impinge on the tubes
C.Combustion occurs in the tubes
D.Water flows through the tubes
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更多“Which of the following stateme…”相关的问题
第1题
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B.Control air supply pressure
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D.Lube oil temperature
第2题
A.Dirty lube oil filter
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C.High lube oil viscosity
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第3题
A.Heat is given off from a high temperature region known as a heat sink
B.Heat transfer rate is affected most by the size of the heat sink involved
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第4题
A.The six-way valve opens
B.The steering service pump motor is stopped
C.The follow-up gear takes the pump off stroke
D.The cylinder relief valves bypass oil to the suction side the pump
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