计算:①(-0.75)+(-112);②(-223)-(-312));③(213

题型:解答题

问题:

计算:
①(-0.75)+(-1
1
2
);
(-2
2
3
)-(-3
1
2
)
);
(2
1
3
-3
1
9
+1
4
45
)÷(-1
1
6
)

④-72+2×(-3)2-(-6)÷(-
1
3
);
1
1
2
×[3×(-
2
3
)-1]-8×[(-2)2-(3-4.5)]
考点:有理数的混合运算
题型:解答题

4米绳子平均分成9段,每段占全长的______,每段______米.

题型:解答题

在理论上,当瓦斯浓度达到()时,瓦斯可以和空气中的氧气完全反应,爆炸强度最大。

A、7%; 

B、8%; 

C、9.5%; 

D、15%。

题型:解答题

I once had a teacher whose husband died of heart attack. About a week after his death, she shared some of her __36___ understanding with students. __37___ the late afternoon sunlight came shinning in and the class was nearly __38___, she moved a few things aside on the edge of her __39___and sat down there.
With a gentle look of reflection(反思) on her face, she paused and said, “Class is over. I would like to   40  with all of you, a thought that is __41___to class, but which I feel is very __42___.”
“Each of us is put here on earth to learn, share, love and give of ourselves. __43___of us knows when this fantastic experience will end. It can be __44___at any moment. Perhaps this is the Power’s way of telling us that we must make the __45___of every single day.”
Her eyes were __46___ to water, but she went on, “So I would like you all to make me a __47___.From now on, on your way to school, or on your way home, find something beautiful to __48___. It could be the __49___of the breeze (微风)slightly rustling the leaves in the trees, or the way the morning light catches one autumn leaf as it __50___gently to the ground.
“Please look for these things, and ___51__them. It is the __52___things that we are put here on earth to enjoy. We must make it important to notice them, for at __53___it can all be taken away.” The class was completely __54___. We all picked up our books and walked out of the room silently. That __55___, I noticed more things on my way home from school than I had that whole semester.
Remember, life is not measured by the number of breaths we take, but by the moments that take our breath away.
小题1:
A.closeB.deepC.sadD.limited
小题2:
A.WithB.ForC.AsD.Once
小题3:
A.overB.outC.offD.away
小题4:
A.classroomB.deskC.computerD.sofa
小题5:
A.shareB.doubtC.wonderD.talk
小题6:
A.unlikelyB.unfairC.unnoticedD.unrelated
小题7:
A.funnyB.modernC.importantD.embarrassing
小题8:
A.NoneB.AllC.EachD.Neither
小题9:
A.put awayB.thrown awayC.taken awayD.given away
小题10:
A.mostB.worstC.lowestD.least
小题11:
A.stoppingB.beginningC.continuingD.ending
小题12:
A.promiseB.predictionC.principleD.rule
小题13:
A.playB.noticeC.spreadD.smell
小题14:
A.voiceB.noiseC.soundD.scream
小题15:
A.knocks B.poursC.reachesD.falls
小题16:
A.provideB.appreciateC.hideD.follow
小题17:
A.generousB.greatC.littleD.formal
小题18:
A.any timeB.a timeC.no timeD.some time
小题19:
A.crowdedB.worriedC.quietD.excited
小题20:
A.morningB.nightC.noonD.Afternoon
题型:解答题

对大多数成人患者来说,一般认为FiO2大于()时,肯定有氧毒性,治疗时间不宜超过48小时。

题型:解答题

链表不具有的特点是

A.不必事先估计存储空间

B.可随机访问任意一个元素

C.插入删除不需要移动元素

D.所需空间与线性表长度成正比

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