DVD-ROM属于( )。A.大容量可读可写外存储器 B.大容量只读外部存储器 C

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问题:

DVD-ROM属于( )。

A.大容量可读可写外存储器

B.大容量只读外部存储器

C.CPU可直接存取的存储器

D.只读内存储器

考点:计算机等级考试B笔试一级B笔试358
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显微外科手术后的护理。

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某医院口腔预防科对当地儿童检查口腔并予以治疗。

医生对该地区部分儿童做了龋活性实验,以下说法错误的是()。

A.实验包括检测菌斑及唾液pH值

B.实验包括检测唾液的缓冲能力

C.实验包括检测致龋菌数

D.实验包括部分治疗性检测

E.对高危人群龋病的控制有一定意义

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When I settled in Chicago,my new city seemed so big and unfriendly. Then I had a ___1___ problem and had to go to hospital for a ___2___ examination.
It seemed a small ___3___ compared to the one I was about to face, but things started to go  ___4___ right from the beginning. Not having a car for ___5___ the city, I was depending on a couple  of buses to get me from A to B. ___6___ I’d left myself plenty of time, soon it was ___7___ that I was going to be late, as I had mistakenly boarded a bus that was taking me in the ___8___ direction.
I ___9___ the bus and stood on the pavement not knowing what to do. I look into the eyes of a ___10___ who  was trying to get past me. __11____ instead of moving on, she stopped to ask if I was ___12___. After I explained my ___13___ to her, she pointed to a bus stop across the street, where a bus would take me back into the city to my ___14___. Sitting there waiting, I felt ___15___ that someone had been willing to help. ___16___, hearing a horn (喇叭) nearby, I looked up to see a car with my new friend ___17___ at me to get in. She had returned to offer me a ___18___ to the hospital.
Such unexpected ___19___ from a passer-by was a lovely gift to receive. As I climbed out of the car at the hospital and turned to thank her, she smiled and told me not to lose ___20___, for all things are possible.
小题1:
A.physicalB.travelingC.socialD.housing
小题2:
A.scientificB.finalC.previousD.thorough
小题3:
A.chanceB.challengeC.successD.error
小题4:
A.wrongB.easyC.fastD.ahead
小题5:
A.leavingB.visitingC.knowingD.appreciating
小题6:
A.AlthoughB.SinceC.UnlessD.Once
小题7:
A.strangeB.necessaryC.clearD.important
小题8:
A.sameB.rightC.generalD.opposite
小题9:
A.looked atB.waited forC.got offD.ran into
小题10:
A.driverB.friendC.strangerD.gentleman
小题11:
A.EspeciallyB.SurprisinglyC.ProbablyD.Normally
小题12:
A.nervousB.excitedC.OKD.dangerous
小题13:
A.ideaB.motivationC.excuseD.situation
小题14:
A.appointmentB.apartmentC.directionD.station
小题15:
A.afraidB.gratefulC.certainD.disappointed
小题16:
A.ThusB.ThenC.PerhapsD.Surely
小题17:
A.staringB.laughingC.wavingD.shouting
小题18:
A.rideB.suggestionC.bikeD.guidebook
小题19:
A.resultsB.newsC.kindnessD.appearance
小题20:
A.powerB.faithC.touchD.support
题型:单项选择题

蝶阀是由旋塞阀演变而来。

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什么是水力机械?分为几类?

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