（）are used widely in the operation of warehouse and distribution center andform the basic handling device for a number of selection system.

（）is the process to handle returned goods,recycle usefu...

单项选择题（）is the process to handle returned goods,recycle useful materials and dispose waste goods.

（）is the Internet commerce designed for direct communic...

单项选择题（）is the Internet commerce designed for direct communications and commercial relationship between a firmand its end customer.

Transport agencies include air and surface（）.A.freightf...

多项选择题Transport agencies include air and surface（）.