单选题With a given load on the cargo hook,the thrust on a cargo boom().Aincreases as the angle to the horizontal increasesBincreases as the angle to the horizontal decreasesCis greatest at an angle of 45° and decreases as the boom is raised or loweredDis least at an angle of 45° and increases as the boom is raised or lowered
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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