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单选题
The boom indicator tells the operator at what angle the boom is compared to the().
A
horizontal position of the boom
B
vertical position of the boom
C
horizontal position of the load being lifted
D
vertical position of the load being lifted
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单选题What is meant by the term“luffing the boom”of a crane().A
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decreases as the boom's angle to the horizontal decreases
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单选题0n a crane ,the boom indicator tells the operator what angle the boom angle is compared to the().A
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material invoices for shipping weightsD
prior experience with similar lifts
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