设阿伏加德罗常数为NA,下列说法正确的是( ) A.78g苯中含有碳碳双键3NA

题型:选择题

问题:

设阿伏加德罗常数为NA,下列说法正确的是(  )

A.78g苯中含有碳碳双键3NA

B.1mol甲基(-CH3)含有电子数为10NA

C.14g乙烯和丙烯的混合物中总原子数为3NA

D.在标准状况下,11.2L辛烷中的碳原子数为4NA

考点:阿伏加德罗常数
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图表法是梳理知识的一种有效方法。下列图表反映的历史事件是

公元前230年                                                           公元前221年
灭韩灭赵灭魏灭楚灭燕灭齐
A. 秦统一六国                              B .秦巩固边疆

C . 秦国加强中央集权                        D .秦国的商鞅变法

题型:选择题

下列哪项不符合小脑幕切迹疝的临床表现()。

A.头痛剧烈,呕吐频繁,烦躁不安

B.呼吸骤停,瞳孔无变化

C.病侧瞳孔先缩小,继而散大

D.双侧瞳孔散大,意识丧失

E.进行性意识障碍

题型:选择题
About a year ago, I went to stay at a Detroit hotel.I didn’t want to     too much money with me, so I       the desk clerk to put a hundred-dollar bill in the       for me.
The next morning, however, the clerk said that he knew nothing about my money. I didn’t have any proof      I had given the man the money. There was clearly     left to do but go to the nearest lawyer at once.
The lawyer       me to return to the hotel with him and give       hundred-dollar bill to the clerk.         we did.An hour later, I went back to the desk and asked for my money together with the lawyer.       I had the lawyer as an eyewitness (证人) to the       hundred-dollar bill,the clerk could not       he knew nothing about it.
Another hour later, I put the second park of the lawyer’s plan into action. This time both the lawyer and I went to the       to ask for the hundred-dollar once again. No matter       I said, the clerk who kept my bill         that he had given it to me. I said it was not        .The lawyer said to him, “I       this gentleman give you a hundred-dollar bill. If you don’t hand it in immediately, I will be forced to call the        .” Now the clerk felt quite        , so he gave me back the first hundred-dollar bill.
“I don’t know        to thank you enough for getting my money back,” I said to the lawyer. And what do you suppose he answered? He said, “Oh, don’t        me. That will be one hundred dollars, please.”
小题1:
A.borrowB.spendC.waste D.carry
小题2:
A.madeB.askedC.allowedD.let
小题3:
A.safeB.deskC.boxD.bag
小题4:
A.thatB.which C.where D.when
小题5:
A.somethingB.nothingC.anythingD.everything
小题6:
A.hoped B.agreed C.insistedD.advised
小题7:
A.the otherB.anotherC.othersD.other
小题8:
A.SuchB.AllC.SoD.Much
小题9:
A.ForB.ThoughC.Even ifD.Because
小题10:
A.firstB.second C.thirdD.one
小题11:
A.sayB.admitC.permitD.recognize
小题12:
A.restaurantB.bankC.hotelD.hospital
小题13:
A.what B.whateverC.whichD.how
小题14:
A.suggestedB.insistedC.requiredD.requested
小题15:
A.trueB.sureC.exactD.nice
小题16:
A.forcedB.madeC.allowedD.saw
小题17:
A.policeB.judgeC.officialD.officer
小题18:
A.contentB.nervousC.angryD.sad
小题19:
A.whenB.whatC.whereD.how
小题20:
A.thankB.praiseC.leaveD.fool
题型:选择题

丙烯产品分析频率一般是每班一次,当出现异常时可提高分析频率。

题型:选择题

4DA-8×6型离心泵,该泵的吸入口直径为()。

A、4in

B、8in

C、6in

D、48in

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