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单选题
With a given load on the cargo hook，the thrust on a cargo boom（）.
A
increases as the angle to the horizontal increases
B
increases as the angle to the horizontal decreases
C
is greatest at an angle of 45° and decreases as the boom is raised or lowered
D
is least at an angle of 45° and increases as the boom is raised or lowered
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更多 “单选题With a given load on the cargo hook，the thrust on a cargo boom（）.A increases as the angle to the horizontal increasesB increases as the angle to the horizontal decreasesC is greatest at an angle of 45° and decreases as the boom is raised or loweredD is least at an angle of 45° and increases as the boom is raised or lowered” 相关考题
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With a given load on the cargo hook，tension in a single span topping lift ______.A.increases as the boom's angle to the horizontal increasesB.is at a maximum when the boom is at a 45° angle to the horizontalC.increases as the boom's angle to the horizontal decreasesD.decreases as the boom's angle to the horizontal decreases
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With a given load on the cargo hook，the thrust on a cargo boom ______.A.increases as the angle to the horizontal increasesB.increases as the angle to the horizontal decreasesC.is greatest at an angle of 45° and decreases as the boom is raised or loweredD.is least at an angle of 45° and increases as the boom is raised or lowered
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考题
单选题Reid vapor pressure is（）.A
exerted by liquid cargo on the sides of a tankB
exerted by liquid cargo on a cargo hose bodyC
the lowest temperature and pressure that will cause a flammable liquid to give off vaporsD
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考题
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loading ballast by gravityC
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考题
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is determined by the thrust stresses on the boom
考题
单选题大副告诉装卸工人不要用钩子装袋装货。（）A
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hookC
blockD
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考题
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protects the hook from the sling ringC
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考题
单选题With a given load on the cargo hook，tension in a single span topping lift（）.A
increases as the boom's angle to the horizontal increasesB
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考题
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考题
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考题
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考题
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checking the vessel's load line calculations carefullyC
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