问题
单项选择题
For any given pedestal crane,when the boom is lengthened, the lifing capacity is（）.
A.unchanged
B.increased
C.eliminated
D.decreased
答案
参考答案：D
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For any given pedestal crane,when the boom is lengthened, the lifing capacity is（）.
A.unchanged
B.increased
C.eliminated
D.decreased
参考答案：D