下列有关化学用语或名称表达正确的是[ ] A.Mg的原子结构示意图: B.H2O

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问题:

下列有关化学用语或名称表达正确的是[ ]

A.Mg的原子结构示意图:

B.H2O2的电子式:

C.的名称:2-乙基丙烷

D.CO32-水解的离子方程式: CO32- +H2O HCO3-+ OH-

考点:电子式的书写原子结构示意图水解方程式有机物的命名
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某车间一窗户面积为20m2,已知室内靠近窗户处的声压级为90dB,靠近窗户处的室内和室外声压级差为15dB,等效室外声源的声功率级应为()。

A.28dB

B.75dB

C.88dB

D.103dB

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提示左心室功能衰竭的是下列哪项()

A.水冲脉

B.交替脉

C.脉搏短绌

D.奇脉

E.脉细速无力

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服务贸易与一般商品贸易相比,其特征是什么。

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Fiona Famous was a very popular girl at school. She felt   1  as no other girl had so many friends at school and in the neighborhood.
But everything  2 on National Friendship Day. On that day in class everyone had to make three presents to give to their three best friends. Fiona   3  the task of choosing three from all the dozens of her friends. However, she was the only one in her class who did not  4 a present! She felt terrible, and spent hours  5 . Everyone came and comforted her for a while.But each one only stayed for a short time before leaving.This was   6  what Fiona had done so many times to others.
She   7  that she was a good companion and acquaintance (泛泛之交), but she had not been a true friend to anyone. She had tried to be close to everyone, but now she found that was not enough to create   8  friendships.
When she got home that night, Fiona told her mother about the whole thing. Her mother said,  "You can't be a close friend to everybody.It's only   9  to have a few true friends.The others will just be playmates or acquaintances.”
Hearing this, Fiona decided to change her way so that she could finally have some true friends. That night, in   10  , she thought about what she could do to get them. She thought about her mother. Her mother was always willing to  11 her, she put up with all of Fiona's dislikes and   12  , she always forgave her, she loved her a great deal ... That was what makes a   13  
And Fiona  14 , realizing that she already had the best friend that anyone could   15  .She fell asleep and had a good dream.
小题1:
A.tiredB.luckyC.strangeD.surprised
小题2:
A.matteredB.developed C.changedD.appeared
小题3:
A.enjoyedB.improvedC.failedD.ruined
小题4:
A.receiveB.showC.completeD.make
小题5:
A.remakingB.thinkingC.cryingD.checking
小题6:
A.especiallyB.graduallyC.brieflyD.exactly
小题7:
A.forgotB.realizedC.doubtedD.complained
小题8:
A.newB.trueC.longD.smart
小题9:
A.possibleB.fairC.importantD.natural
小题10:
A.chairB.bedC.schoolD.table
小题11:
A.correctB.followC.helpD.find
小题12:
A.dreamsB.ideasC.storiesD.problems
小题13:
A.playmate B.parentC.friendD.mother
小题14:
A.smiledB.sufferedC.screamedD.hesitated(犹豫)
小题15:
A.compareB.protectC.rememberD.want
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作物水分临界期和关键期

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