问题描述：
[单选]
（）is very convenient equipment for loading and unloading goods．
A．Crane
B．Pallet truck
C．Fork lift
D．Fork lift truck
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答案解析：无
答案解析：无
上一篇：（）has three parts( ) warehouse， high story shelf and stacker．
下一篇：（）performs two basic functions-marketing and logistics．
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