Stress on the topping lift of a swinging boom can be reduced by（）.<br>A:rigging a back stay<br>B:raising the boom<br>C:increasing the mechanical advantage of the cargo purchase<br>D:taking all slack out of the preventer

Stress on the topping lift of a swinging boom can be reduced by（）.
A:rigging a back stay
B:raising the boom
C:increasing the mechanical advantage of the cargo purchase
D:taking all slack out of the preventer

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