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)_做题室

单项选择题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：
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