單項(xiàng)選擇題Here some oil in the oily water separator, as a result of its lower （）, will separate and rise into the oil collection space.
A.temperature
B.viscosity
C.density
D.velocity
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1.單項(xiàng)選擇題Heat energy is a source of power, but （） will cause damage to the engine.
A.excessive heat
B.insufficient heat
C.effective cooling
D.high output
2.單項(xiàng)選擇題Head tank should be used to remove （） from cooling water.
A.scale
B.sludge
C.chemicals
D.air
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