当置信度为0.95时,测得Al2O3的μ置信区间为(35.21±0.10)%,其意义

题型:单项选择题

问题:

当置信度为0.95时,测得Al2O3的μ置信区间为(35.21±0.10)%,其意义是()

A、在所测定的数据中有95%在此区间内;

B、若再进行测定,将有95%的数据落入此区间内;

C、总体平均值μ落入此区间的概率为0.95;

D、在此区间内包含μ值的概率为0.95;

考点:化学分析工考试化学分析工考试题库
题型:单项选择题

紧急停车后,对碳三加氢反应器的处理错误的是()。

A.关闭反应器氢气调节阀上下游阀

B.停反应器的碳三进料

C.关反应器的进出口阀

D.反应器泄压

题型:单项选择题

填空

         阅读下面短文,按照句子结构的语法性和上下文连贯的要求,在空格处填入一个适当的词或使用括号中词语的正确形式填空,并将答案填写在标号为1~10的相应位置上。

     A group of robbers dug their way into the basement of a bank in Paris and emptied almost 200

private safes(保险箱).

     They entered the Credit Lyonnais branch using building __1__(equip) to dig holes and destroy

walls __2__ Saturday night. They tied up a security guard and spent __3__ next nine hours robbing

the bank.

     One investigator described the robbery __4__ a "professional job". The robbers came in at about

22: 00 on Saturday __5__ left at 7: 00 on Sunday. They entered through the basements of the

neighboring building, digging through a series of tunnels and making a hole into a wall of 80 cm thick

to get into the bank, __6__ was having building works at the time.

     When they left, the robbers set the place on fire to remove any trace of evidence, __7__(switch)

on the antifire system and flooding the building. __8__(fortune), the guard escaped unharmed.

     __9__ is difficult to estimate(估计) the total value of what __10__(steal) as only the bank's

clients(储户) know the content of their private safes.

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小麦粉中的矿物质主要有()、()、()、()及()等金属盐类,统称为灰分。

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关于鞭毛、纤毛的运动,下列叙述正确的是()

A.鞭毛的运动依赖于鞭毛基部的某种动力装置

B.由于纤毛中央鞘的限制使滑动变成弯曲运动

C.鞭毛、纤毛运动是二联管间相对滑动的结果

D.A管上的动力蛋白臂是运动的动力源

E.二联管之间的滑动可使鞭毛的轴索产生弯曲的力

题型:单项选择题

某单位利用业余时间举行了3次义务劳动,总计有112人次参加,在参加义务劳动的人中,只参加1次、参加2次和3次全部参加的人数之比为5:4:1。问该单位共有多少人参加了义务劳动

A.70

B.80

C.85

D.102

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