皮皮学，免费搜题
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【单选题】
大山中学所有骑自行车上学的学生都回家吃午饭，因此，有些家在郊区的大山中学的学生不骑自行车上学。为使上述论证成立，以下哪项关于大山中学的断定是必须假设的?
A.
骑自行车上学的学生家都不在郊区。
B.
回家吃午饭的学生自行车上学。
C.
家在郊区的学生都不回家吃午饭。
D.
有些家在郊区的学生不回家吃午饭。
E.
有些不回家吃午饭的学生家不在郊区。
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【单选题】一圆柱直齿齿轮,模数为4,齿数为18,其齿顶圆直径为( )mm。
A.
72
B.
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