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【单选题】
下 列关于 m ( m 3 3) 阶 B - 树的叙述中,错误的是 ________ 。A.
每个结点至多有 m 个关键字
B.
根 结点至 少 有 1 个关键字
C.
所有的点均在同一层上
D.
根结点至少有 2 棵子树
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【简答题】只要写出PNP硅管,或者PNP锗管,就可以,不用画出B,C,E。
【单选题】Do you often feel the quality of the goods we buy these days isn't as good as it ought to be? In the past, when things were made by hand, it seems there was a lot of pride in individual workmanship. P...
A.
workmanship now can not be found as it was in the past
B.
the toaster was broken because Mary used it too much
C.
the quality of goods now isn't as good as it was
D.
it is fair enough for the store not to give money back to Mary
【简答题】图中虚线内部件由___和___阀体组成。
【简答题】如果x>0, 输出x大于零,否则输出x小于等于零
【单选题】已知F 1 ，F 2 为椭圆 x 2 a 2 + y 2 b 2 =1 （a＞b＞0）的两个焦点，过F 2 作椭圆的弦AB，若△AF 1 B的周长为16，椭圆的离心率 e= 3 2 ，则椭圆的方程为（ ）
A.
x 2 4 + y 2 3 =1
B.
x 2 16 + y 2 3 =1
C.
x 2 16 + y 2 4 =1
D.
x 2 16 + y 2 12 =1