题目:
一项工程,甲队独做12天完工,乙队独做18天完工,二队合做几天完工?
答案:
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答案:D题目分析:which bus should I take?我该乘哪趟公交车?how far is the post office from here?从这儿到邮局有多远?how many post offices are there?有多少家邮局?which is the way...