【单选题】
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
A、increase the lifting capacity
B、increase the lifting radius
C、protect the slings
D、protect the upper part of a load
A、increase the lifting capacity B、increase the lifting radius C、protect the slings D、protect the upper part of a load
A、A.increase the lifting capacity B、B.increase the lifting radius C、C.protect the slings D、D.protect the upper part of a load