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单选题
winch platform（）
A
起货机平台
B
夹板
C
千斤顶
D
油压千斤顶
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单选题A mechanical davit is designed to automatically（）.A
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单选题The limit switches on a ships survival-craft winch system（）.A
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单选题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
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单选题If an attempt is made to hoist a load that exceeds the capacity of an electric winch，an overload safety device causes a circuit breaker to cut off the current to the winch motor（）.A
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after the line pull exceeds the rated winch capacityC
after a short build-up of torqueD
immediately
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单选题Limit switches（）.A
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单选题When retrieving the survival craft，the winch operator should stop the winch and check（）.A
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