单项选择题

Solid waste generation，and electricity and water consumption are costly and have their own set of environmental（）.

A.inspect
B.impairs
C.impacts
D.insects

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A.commence
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C.give
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A.to their final position with the winch operating at slow speed
B.to the bar stop，and then hand cranked to their final position
C.until just before they make contact with the limit switch，and then hand cranked to their final position
D.to the embarkation deck，and then hand cranked to their final position

甲板与船体保养

Solid waste generation，and electricity and water consumption are costly and have their own set of environmental（）.