减压过滤后晶体要用乙醇来洗涤,为什么?A.乙醇便宜B.硫代硫酸钠不溶于乙醇，可以...

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【单选题】

减压过滤后晶体要用乙醇来洗涤,为什么?

乙醇便宜

硫代硫酸钠不溶于乙醇，可以防止因洗涤而损失产品

乙醇容易挥发

以上都对

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参考答案：

举一反三

【单选题】The maritime labour certificate shall be issued to _____ by the competent authority, or by a recognized

ganization duly authorized for this purpose.

a ship

a country

an authority

a person

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【单选题】According to Maritime Labour Convention, 2006, the minimum hours of rest shall not be less than ____________.

72 hours in any 7-day period

77 hours in any 7-day period

14 hours in any 24-hour period

none of the other alternatives

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【单选题】According to Maritime Labour Convention, 2006, the minimum hours of rest shall not be less than ____________.

12 hours in any 24-hour period

. 72 hours in any 7-day period

10 hours in any 24-hour period

88 hours in any 7-day period

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【单选题】仓储区通常应有单独的物料取样区。取样区的空气洁净度级别与生产要求相比应当( A )。如在其他区域或采用其他方式取样,应能防止污染或交叉污染。

一致

高于生产要求一个级别

低于生产要求一个级别

无规定

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【单选题】The company isnt______doing such big business.

able to

capable to

able of

capable of

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【单选题】下列关于E-mail的功能说法正确的是_____ 。

在发送电子邮件时，一次只能发送给一个人

用户写完的E-mail必须立即发送

用户收到的E-mail一定按日期排序

接收E-mail所用的网络协议是HTTP

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【简答题】A．People are not as capable as they think. B．People can be more capable than they think. C．Lack of knowledge leads to failure. D．Lack of ability results in lack of determination.

查看完整题目与答案

【单选题】According to Maritime Labour Convention, 2006, the minimum hours of rest shall not be less than ____________.

10 hours in any 24-hour period

72 hours in any 7-day period

14 hours in any 24-hour period

none of the other alternatives

查看完整题目与答案

【单选题】A Class1 MES is capable of ____.

ship-to-shore and shore-to-ship message transfer and distress alerting, but is not capable of receiving EGC messages

ship-to-shore and shore-to-ship message transfer and distress alerting, and be capable of receiving EGC messages

ship-to-shore and shore-to-ship message transfer and receiving EGC messages, but is not capable of distress alerting

distress alerting and receiving EGC messages, but is not capable of ship-to-shore and shore-to-ship message transfer

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【单选题】( ) 282. Si je continuais à créer, je ____ bien capable de rater mon affaire.

suis

étais

serai

serais

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ganization duly authorized for this purpose.

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【单选题】According to Maritime Labour Convention, 2006, the minimum hours of rest shall not be less than ____________.

72 hours in any 7-day period

77 hours in any 7-day period

14 hours in any 24-hour period

none of the other alternatives

查看完整题目与答案

【单选题】According to Maritime Labour Convention, 2006, the minimum hours of rest shall not be less than ____________.

12 hours in any 24-hour period

. 72 hours in any 7-day period

10 hours in any 24-hour period

88 hours in any 7-day period

查看完整题目与答案

查看完整题目与答案

【单选题】The company isnt______doing such big business.

查看完整题目与答案

【单选题】下列关于E-mail的功能说法正确的是_____ 。

查看完整题目与答案

【简答题】A．People are not as capable as they think. B．People can be more capable than they think. C．Lack of knowledge leads to failure. D．Lack of ability results in lack of determination.

查看完整题目与答案

【单选题】According to Maritime Labour Convention, 2006, the minimum hours of rest shall not be less than ____________.

10 hours in any 24-hour period

72 hours in any 7-day period

14 hours in any 24-hour period

none of the other alternatives

查看完整题目与答案

【单选题】A Class1 MES is capable of ____.

ship-to-shore and shore-to-ship message transfer and distress alerting, but is not capable of receiving EGC messages

ship-to-shore and shore-to-ship message transfer and distress alerting, and be capable of receiving EGC messages

ship-to-shore and shore-to-ship message transfer and receiving EGC messages, but is not capable of distress alerting

distress alerting and receiving EGC messages, but is not capable of ship-to-shore and shore-to-ship message transfer

查看完整题目与答案

【单选题】( ) 282. Si je continuais à créer, je ____ bien capable de rater mon affaire.

查看完整题目与答案

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