For economic reasons,shipbuilders have designed vessels that can be loaded and ( ) in a minimum amount of time with minimum labor. ( 章节：6 难度：2)
- A、loading
- B、unloaded
- C、unloading
- D、load
正确答案:B
答案解析:有
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For economic reasons,shipbuilders have designed vessels that can be loaded and ( ) in a minimum amount of time with minimum labor. ( 章节：6 难度：2)
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