光信号能够在光纤中以极低的损耗传输是利用了光纤的()原理。A.反射 B.折射 C.全

题型:单项选择题

问题:

光信号能够在光纤中以极低的损耗传输是利用了光纤的()原理。

A.反射

B.折射

C.全反射

D.透射

考点:电子与通信技术接入网技术接入网技术题库
题型:单项选择题

男性,70岁,30小时前剧烈咳嗽后突然出现右下腹剧烈疼痛,疼痛性质为持续胀痛,伴有恶心,呕吐,右侧阴囊肿胀疼痛。既往有右侧腹股沟可复性包块史。查体:右侧腹股沟韧带中点上方至右侧阴囊隆起,呈梨形,不能回纳,有轻压痛。临床诊断初步考虑为“右腹股沟嵌顿疝”

若经初步处理后进行急诊手术治疗,手术中必须注意的关键在于

A.严密预防休克发生

B.鉴别嵌顿的是直疝还是斜疝

C.判断被嵌顿的组织的生命力

D.注意有无腹壁缺损存在

E.明确嵌顿的疝内容物的性质

题型:单项选择题
Do you like to eat some _____?

A.beef and potato dumplings
B.beef and potatoes dumplings
C.beeves and potatoes dumplings
D.beeves and potato dumplings
题型:单项选择题
In a land far away, once upon a time there was great poverty (贫困),and only the rich could manage without great _36. Three of those rich men and their servants were_37_together on a road when they came to a very_38_village.
The first could not stand seeing the poverty, _39 he took all the gold and jewels from his wagons (四轮载重马车) and shared 40 out among the villagers. He wished them all the best of luck, and he left.
The second rich man ,seeing the _41 situation, stopped for a short time and gave _42 all his food and drink, since he _43  see that money would be of little _44 to them. He made sure that they each 45their fair share and would have enough food to _46 for some time . Then, he left.
The third rich man, on seeing such poverty, _47  and went straight through the _48  without stopping. The two other rich men saw this from a distance and commented with each other 49 the third rich man lacked sympathy. It was _50  that they themselves had been there to offer help.
However, three days later, they 51the  third rich man ,who was coming in the opposite direction . He was 52  travelling quickly, but his wagons,  53  the gold and valuables they had been  54  ,were now full of farming tools and bags of  55 .He was rushing back to help them out of poverty.
小题1:
A.lossB.expectationsC.successD.problems
小题2:
A.standingB.travellingC.gatheringD.running
小题3:
A.farawayB.poorC.differentD.ancient
小题4:
A.unlessB.becauseC.soD.if
小题5:
A.themB.anythingC.nothingD.those
小题6:
A.curiousB.worryingC.dangerousD.puzzling
小题7:
A.the villagersB.his servantsC.the othersD.the rest
小题8:
A.couldB.mightC.shouldD.must
小题9:
A.interestB.concernC.useD.attraction
小题10:
A.returnedB.gainedC.offeredD.received
小题11:
A.remainB.lastC.supplyD.share
小题12:
A.turned backB.set outC.showed offD.speeded up
小题13:
A.villageB.landC.fieldD.road
小题14:
A.whetherB.howC.whereD.when
小题15:
A.goodB.certainC.trueD.strange
小题16:
A.welcomedB.metC.acceptedD.persuaded
小题17:
A.stillB.alreadyC.alwaysD.indeed
小题18:
A.exceptB.instead ofC.apart fromD.along with
小题19:
A.loadingB.treasuringC.carryingD.earning
小题20:
A.foodB.jewelsC.moneyD.seeds
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