问题：
[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
参考答案：
A
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