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【简答题】
已知 e 1 、 e 2 是平面上两个不共线的向量，向量 a =2 e 1 - e 2 ， b =m e 1 +3 e 2 ．若 a ∥ b ，则实数m=______．
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【单选题】设整型变量n的值为2,执行语句"n += n;"后n的值是( )。
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【单选题】单基因遗传病中,当父亲某病患者时是,无论母亲是否有病,他们子女中的女孩全都患此病,此种遗传病可能是
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查看完整题目与答案