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
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A.non-pulsating
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C.positive
D.non-positive -
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In （） pump a closed discharge valve will not cause excessive pressure to build up.
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