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【多选题】
维生素B12可用于治疗A.
恶性贫血
B.
巨幼红细胞性贫血
C.
神经炎
D.
哮喘
E.
神经痛
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举一反三
【简答题】女子个人时间为___________。 A、30秒 C、60秒 B、90秒 D、120秒
【单选题】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
【单选题】Electric cargo winches have an overload safety device which normally cuts the current to the winch motor（）.
A.
after torque cause line pull to exceed the rated capacity of the winch
B.
before the line pull reaches the rated capacity of the winch
C.
when the line pull reaches the breaking strengh of the fall
D.
before the safe working load of the fall is reached
【简答题】我会比．（填“＞”“＜”或“﹦”） 60分______60秒 20分______1时 1分______85秒 60秒______1分 1时______55分 90分______1时．
【单选题】Electric cargo winches have an overload safety device which normally cuts the current to the winch motor（）.
A.
after torque causes line pull to exceed the rated capacity of the winch
B.
before the line pull reaches the rated capacity of the winch
C.
when the line pull reaches the breaking strength of the fall
D.
before the safe working load of the fall is reached
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