With a given load on the cargo hook，the thrust on a cargo boom（）.<br>A:increases as the angle to the horizontal increases<br>B:increases as the angle to the horizontal decreases<br>C:is greatest at an angle of 45° and decreases as the boom is raised or lowered<br>D:is least at an angle of 45° and increases as the boom is raised or lowered

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

出自：海船船员证

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