When working with lumber, wire and staples are not desirable to be used because（）.<br>A:they are not subjected to cause trouble<br>B:they are difficult to handle this kind of cargo<br>C:the efficiency of separating is raised<br>D:the efficiency of loading is greater

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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