单项选择题

利用键盘,按______可以实行输入法方式的切换。

A、+空格键
B、+空格键
C、+
D、+空格键
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单项选择题
You know I saw Mr. Wang just now in his office. -That ()him since he won’t come back until the end of this year.
A、can’t be
B、couldn’t have been
C、mustn’t have been
D、shouldn’t have been
单项选择题
如果由某一次数分布计算得SK=- 0. 35,则该次数分布为( )。
A. 高狭峰分布
B. 低阔峰分布
C. 正偏态分布
D. 负偏态分布
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