With a given load on the cargo hook，the thrust on a car

单项选择题

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

货物保险合同与业务