单项选择题
All bilge suction must be fitted with suitable （）, which in the machinery space would be mud boxes positioned at floor-plate level for easy access.
A.strainers
B.valves
C.elements
D.separators
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相关考题
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单项选择题
Centrifugal pumps, however, can be designed with a number of impellers （） to attain a large amount of liquid.
A.in series
B.in parallel
C.assembled
D.together -
单项选择题
Sealing in pump shaft is achieved by means of the （）.
A.gasket
B.packing
C.washer
D.spring -
单项选择题
（） is the breakdown of surface tension between oil droplets in an oil water mixture which causes them to join and increase in size.
A.Wear
B.Contaminating
C.Coalescence
D.Coarse separating
