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單項(xiàng)選擇題

The packing installed in the pump stuffing box is lubricated by （）.

A.gravity and feed oil cups
B.grease cups
C.hand during installation
D.leakage through the stuffing box

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單項(xiàng)選擇題

The steam coils in a high pressure evaporator used for saltwater service should be de-scaled with （）.

A.a needle gun
B.soap and water
C.a wire brush
D.a chipping hammer

單項(xiàng)選擇題

Which of the listed chemicals can be routinely used to maintain the hygienic quality of potable water?（）

A.Hydrochloric acid
B.Chlorine
C.Sulfuric acid
D.Zinc chromate

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