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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，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
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exerted by liquid cargo on the sides of a tankB
exerted by liquid cargo on a cargo hose bodyC
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考题
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考题
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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
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考题
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考题
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考题
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