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【单选题】
有机物 的正确命名为 [ ]A.
2-乙基-3，3-二甲基
B.
3，3-二甲基-4-乙基
C.
3，3，4-三甲基己烷
D.
2，3，3-三甲基己烷
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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
【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】Richard had trouble concentrating and learning in school because he was
A.
poor and hungry.
B.
distracted by Helene.
C.
lonely.
D.
unable to read.
【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
【单选题】A 25-year-old man comes to the psychiatrist with a chief complaint of depressed mood for 1 month. His mother, to whom he was very close, died 1 month ago, and since that time he has felt sad and been ...
A.
Major depression
B.
Dysthymia
C.
Posttraumatic stress disorder
D.
Adjustment disorder
E.
Uncomplicated bereavement
【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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