已知X+、Y2+、Z—、W2—四种离子均具有相同的电子层结构。下列关于X、Y、Z

题型:选择题

问题:

已知X+、Y2+、Z、W2—四种离子均具有相同的电子层结构。下列关于X、Y、Z、W四种元素的描述,不正确的是

A.原子序数:Y>X>Z>W

B.离子半径:X>Y>Z>W

C.原子最外层电子数:Z>W>Y>X

D.还原性:X>Y,W2—>Z

考点:构成物质的粒子—分子、原子、离子元素周期律
题型:选择题

麻醉期间低血压的常见原因不包括()。

A.低血容量

B.椎管内麻醉平面过高

C.药物的作用

D.镇痛不全

E.手术机械压迫

题型:选择题

银行汇票是否可以在同城使用?

题型:选择题
I would like to suggest that for sixty to ninety minutes each evening all television broadcasting in the United States be forbidden by law. Let us take a      , reasonable look at what the results might be if such a(an)     were accepted.
Families might use the time for a real family hour. Without the distraction(分散注意力) of TV, they might    together after dinner and actually talk to one another. It is well known that many of our   ----everything in fact, from the generation gap to the high divorce rate to some forms of    illness ----are caused at least in part by    to communicate. By using the quiet family hour to     our problems, we might get to know each other better, and to like each other better. On evenings when such talk is     , families could discover more active pastimes(娱乐). Freed from TV and forced to find their own activities, they might take a     together to watch the sunset    they might take a walk together.
     free time and no TV, children and adults might discover reading. There is more entertainment in       than in a TV program.       report that the generation growing up with television can hardly write an English sentence,       at the college level.    is often learned from reading. A more literate new generation could be a product of the quiet hour. A different form of reading might also be done     it was in the past: reading aloud. The quiet hour could become the story hour. When the    ends, the TV networks might be forced to    with better shows in order to get us back from our newly- discovered activities.
At first glance, this idea seems radical(激进的).    will we spend the time then? The fact is: it has been only twenty-five years since television came to control American free time. Those of us thirty-five and older can    childhoods without television. It wasn't that difficult.
小题1:
A.valuableB.pleasantC.seriousD.quick
小题2:
A.suggestionB.adviceC.opinionD.offer
小题3:
A.get aroundB.sit aroundC.meet withD.stand stiff
小题4:
A.misfortunesB.troublesC.affairsD.problems
小题5:
A.physicalB.mentalC.commonD.familiar
小题6:
A.failureB.attemptC.abilityD.permission
小题7:
A.commentB.talkC.discussD.remark
小题8:
A.impossibleB.unpleasantC.funnyD.unnecessary
小题9:
A.rideB.lookC.walkD.rest
小题10:
A.AndB.ButC.OrD.While
小题11:
A.AtB.WithC.ForD.In
小题12:
A.a good bookB.a fine poemC.a quiet hour D.a composition
小题13:
A.ProfessorsB.ScientistsC.EducatorsD.Parents
小题14:
A.yetB.stillC.justD.even
小题15:
A.SkillB.WritingC.Speaking D.Listening
小题16:
A.beforeB.asC.afterD.when
小题17:
A.talkB.programmeC.performanceD.quiet-hour
小题18:
A.come acrossB.come aboutC.come outD.come up
小题19:
A.HowB.WhetherC.WhatD.If
小题20:
A.remindB.recognizeC.rememberD.know
题型:选择题

1~3岁的小儿,每日水的需要量是()

A.50~90ml/kg

B.70~100ml/kg

C.100~140ml/kg

D.120~160ml/kg

E.160~180ml/kg

题型:选择题

二型观测线测出的倒凹区主要位于基牙的

A.接近龈缘
B.远缺隙侧
C.牙合面
D.近远缺隙侧均有明显倒凹
E.近缺隙侧

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