下列几种物质露置于空气中都会变质,其中一种物质不同于另外三种物质的是() A.钠

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问题:

下列几种物质露置于空气中都会变质,其中一种物质不同于另外三种物质的是(   )

A.钠

B.漂白粉

C.氧化钠

D.过氧化钠

考点:氧化钠单质钠其他钠盐(氯化钠、硫化钠、氮化钠等)过氧化钠
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Dear Susan,
You are only three years old, and at this point in your life you are not able to understand this letter. But some day when you grow up, I hope you will find something        in what I am going to share with you.
Life can be       . There will be people in your life who won’t be very nice. They’ll laugh at you because you are different,        for no good reason. You will also face heartbreak (心碎) and might be       by those you love. I hope you don’t have to face these too much, but such things happen.
Be open to life anyway. You’ll find cruelty in your      through life, but don’t let that stop you from finding new things. Don’t retreat (退却) from life, and don’t         yourself. Be open to new things, new experiences and new people. You will fail many times, but if you allow that to stop you from trying, you will miss many chances. Do remember that failure (失败) is a stepping stone to success.
You will meet many people who will try to do better than you, in school, in college and at work. They’ll try to have nicer cars, bigger houses, nicer clothes, and so on. To       , life is a competition. However, I believe life is a journey. If you always try your best to        others, you are wasting your life. Learn to enjoy your life danger and you will make it a journey of      , of learning and of love.
Finally, know that I love you and always will. You are        a really wonderful journey, and I will always be there for you.
Love
Dad
小题1:
A.normalB.familiarC.valuableD.interesting
小题2:
A.simpleB.enjoyableC.peacefulD.unkind
小题3:
A.andB.orC.butD.so
小题4:
A.hurtB.acceptedC.protectedD.affected
小题5:
A.journeyB.school C.studyD.days
小题6:
A.struggleB.completeC.hideD.forgive
小题7:
A.meB.themC.youD.him
小题8:
A.followB.changeC.pardonD.introduce
小题9:
A.dangerB.quietnessC.happinessD.cruelty
小题10:
A.destroyingB.completingC.developingD.starting
题型:选择题

如果出口货物需要办理出口收汇核销,报关员应在申报时向海关提交( )。

A.出口付汇证明

B.出口收汇核销单

C.出口货物报关单(收汇证明联)

D.出口退税证明

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英美法系国家最主要的法律渊源是()

A.成文法

B.判例法

C.习惯法

D.国际法

题型:选择题

述氢气孔产生的机理。

题型:选择题

氯琥珀胆碱(Suxamethonium Chloride)

A.对称的1-苄基四氢异喹啉类肌松药
B.单季铵结构甾类肌松药
C.双季铵结构甾类肌松药
D.季铵类生物碱肌松药
E.去极化性肌松药

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