在一个单项分配数列中,若各组变量值都减少一半,每组次数增加1倍,中位数()
A.减少一半
B.增加1倍
C.增加2倍
D.不变
参考答案:A
_______ in the regulations that you should not tell other people the password of your e-mail account.
A.What is required
B.What requires
C.It is required
D.It requires
在不同出力下,水机效率变化不大的是()式水轮机。
A、混流;
B、轴流转桨;
C、斜流;
D、轴流定桨。