单项选择题
The clutch band of a constant tensioning mooring winch must be set up tight enough to drive the winch drum and should slip only when （）.
A.excessive loads are placed on the winch
B.minimum pull is being exerted by the winch
C.automatic operation of the winch is desired
D.wire is being retrieved at the maximum rate
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The advantages of flash type evaporators, as compared to submerged tube type evaporators, include （）.
A.less internal corrosion because of lower brine density
B.higher temperature evaporation for lower salinity of the distillate produced
C.less scale formation in a flash evaporator
D.less feed-water required for a flash evaporator -
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The （）is used to burn oil sludge.
A.clarifier
B.oil/water separator
C.incinerator
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Which is the pollution prevention equipment?（）
A.booster pump
B.evaporator
C.incinerator
D.cooler
