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【判断题】
左手笛卡尔法规定了X、Y、Z三个坐标轴方向。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】The scientist knew nothing about the matter, because he was always _________ himself in his study.
A.
burying
B.
devoting
C.
focusing
D.
concentrating
【简答题】It happened towards evening, when I was resting in a cafe. I 36 a pair of newly bought white leather shoes, which were rather expensive. Then 37 came to me. He was in an unfit shirt, 38 pale and weak...
【单选题】从2000名学生中按不重复抽样方法抽取100学生进行调查,其中有女生45名,则样本成数的抽样平均误差为( )
A.
0.24%
B.
4.85%
C.
4.97%
D.
以上都不对
【简答题】收到宏达公司前欠货款 100 000元,收到银行收账通知单。(2分)
【单选题】从2000名学生中按不重复抽样的方法抽取了100名进行调查,其中有女生45名,则样本成数的抽样平均误差为
A.
0.24%
B.
4.85%
C.
4.97%
D.
以上都不对
【单选题】从2000名学生中按不重复抽样方法抽取了100名进行调查，其中有女生45名，则样本成数的抽样平均误差为( )。
A.
0.24%
B.
4.85%
C.
4.97%
D.
以上都不对
【简答题】It happened towards evening, when I was resting in a cafe. I a pair of newly bought white leather shoes, which were rather expensive. Then came to me. He was in an unfit shirt, pale and weak. He looke...
【单选题】从2000名学生中按不重复抽样方法抽取了100名进行调查，其中有女生45名，则样本比例的抽样平均误差为
A.
0.24%
B.
4.85%
C.
4.97%
D.
以上都不对
【单选题】从2000名学生中按不重复抽样方法抽取了100名进行调查，其中有女生45名，则样本成数的抽样标准误为
A.
0.24%
B.
4.85%
C.
4.97%
D.
以上都不对
【单选题】When I came in,he was ___his book.
A.
Concentrating on
B.
contributed on
C.
burying on
D.
Focused on
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