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【简答题】
用一台旧仪器测定溶液的吸光度6次,得标准偏差s 1 =0.055;再用一台性能稍好的新仪器测定4次,得标准偏差s 2 =0.022。 计算其方差F= ;得 F 表 =9.01 ,判断两种分析方法的精密度之间 显著性差异。(是否存在)
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举一反三
【单选题】Lesson Two Text A Vocabulary Multiple choices-2 2. PFD is designed to improve a pilot’s situational awareness by ______ most of information into a single display unit instead of on different ogue ...
A.
integrating
B.
including
C.
incorporating
D.
containing
【单选题】由于发包人原因导致工程无法按规定期限进行竣(交)工验收的,在承包人提交竣(交)工验收报告( )d后,工程自动进入缺陷责任期。
A.
30
B.
45
C.
60
D.
90
【单选题】纳税人被列入非正常户超过( )的,税务机关可以宣布其税务登记证件失效。
A.
1个月
B.
2个月
C.
3个月
D.
6个月
【单选题】What are the two classics mentioned in the text A of Unit4?
A.
Iliad and Odessey
B.
Odessey and Aeneid
C.
Exodus and Aeneid
D.
Odessey and Exodus
【判断题】纳税人被列入非正常户超过6个月的,税务机关可以宣布其税务登记证件失效。
A.
正确
B.
错误
【单选题】How are the two different groups of customers categorized in para.2, Text A, Unit 5?
A.
Rich customer and poor customer.
B.
Rich customer and Failing customer.
C.
Valued customer and poor customer.
D.
Failing customer and valued customer.
【单选题】由于发包人原因导致工程无法按规定期限竣(交)工验收的,在承包人提交竣(交)工验收报告( )d后,工程自动进入缺陷责任期。
A.
28
B.
30
C.
60
D.
90
【单选题】Unit 8 Text B.docx Comprehension of the Text B Choose the best answer for each of the following multiple choice questions. From what the author says in the text, we know that the text has been written...
A.
teach kids how to make big money
B.
teach kids ways of money management
C.
explain some basic ideas of economics
D.
explain the meaning of two old sayings
【单选题】根据税收征收管理法律制度的规定,纳税人被列入非正常户超过一定期限的,税务机关可以宣布其税务登记证件失效。该期限是( )。
A.
9个月
B.
3个月
C.
4个月
D.
6个月
【判断题】由于发包人原因导致工程无法按规定期限进行竣(交)工验收的,在承包人提交竣(交)工验收报告 60 天后,工程自动进入缺陷责任期。
A.
正确
B.
错误
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