问题
单项选择题
A spreader bar is used to（）.
A.increase the lifting capacity
B.increase the lifting radius
C.protect the slings
D.protect the upper part of a load
答案
参考答案：D
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A spreader bar is used to（）.
A.increase the lifting capacity
B.increase the lifting radius
C.protect the slings
D.protect the upper part of a load
参考答案：D