题目内容

污水处理的一级排放标准要求，CODcr≤（），SS≤（），PH=（）。

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According to this passage, which of the following statements is true？

A. In boiler and machinery spaces, there is the air conditioning.
B. In the boiler rooms the requirement of air volume should meet 25-50% of combustion requirement.
C. To maintain the comfort zone in the separate control room the air conditioning plant should be fitted.
D. The comfort conditions can be maintained in the engine room all the time.

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At the middle pressure and large air quantity,_________ is more suitable.

A. an axial flow fan
B. a radial flow blower
C. a centrifugal fan
D. an auxiliary blower

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The axial flow fan is particularly suited to handle these large air volumes at the moderate pressures required, while of course the “straight-through” flow feature places it at an advantage over the centrifugal fan.
The increasing adoption of automation, with the provision of a separate control room makes less significant the fact that comfort conditions cannot be maintained in the engine room all the time. Which of the following devices should be taken to maintain ambient conditions of the boiler and machinery space？

A. air compressor
B. air cooler
C. air-conditioning plant
D. mechanical ventilation plant

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The oil sludge is burnt in the ______onboar

A. I’ll show you the ashes.
B. boiler
C. main engine
D. auxiliary engine
E. incinerator

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