單項(xiàng)選擇題

If you change from a low pour point lubricant to a high pour point lubricant in a refrigeration system, （）.

A.compressor lubrication will be improved
B.oil will not leave the crankcase
C.compressor valves will be damaged
D.oil may congeal in the evaporator

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單項(xiàng)選擇題

When a vessel is in dry-dock, the vessel’s engineers should （）.

A.examine the condition of the propeller
B.chip and paint all hull protection zincs
C.install new docking plugs in all cofferdams
D.inspect the hull for hogging or sagging

單項(xiàng)選擇題

Air line lubricators are used in compressed air systems to lubricate （）.

A.the suction and discharge valves
B.tools and equipment served by compressed air
C.air line reducing valves
D.all of the above