单选题When working with lumber, wire and staples are not desirable to be used because（）.Athey are not subjected to cause troubleBthey are difficult to handle this kind of cargoCthe efficiency of separating is raisedDthe efficiency of loading is greater
单选题
When working with lumber, wire and staples are not desirable to be used because（）.
A
they are not subjected to cause trouble
B
they are difficult to handle this kind of cargo
C
the efficiency of separating is raised
D
the efficiency of loading is greater
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