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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Fueling activities（）waste liquids and vapor releases to air.
A.commence
B.generate
C.give
D.have -
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Any Works completion date quoted by the Repairer is an estimate only and the Repairer shall not be（）liable for any failure to complete the Works by that date.
A.liable for any repair
B.liable for any failure
C.responsible for any repair
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When hoisting a boat on gravity type davits using an electric motor driven winch，the davit arms should be brought up（）.
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
