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现有一批零件，甲师傅单独加工需要4小时
【例4】（2017广东）现有一批零件，甲师傅单独加工需要4小时，乙师傅单独加工需要6小时。两人一起加工这批零件的 50％需要（ ）小时。 Ａ. 0.6 Ｂ. 1 Ｃ. 1.2 Ｄ. 1.5
工程问题专项知识精讲及历年真题解析视频合集5/43
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