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【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 increases

B、is at a maximum when the boom is at a 45° angle to the horizontal

C、increases as the boom's angle to the horizontal decreases

D、decreases as the boom's angle to the horizontal decreases

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第1题

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第2题

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第3题

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第4题

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第5题

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第6题

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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第7题

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第8题

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