单项选择题X 纠错
A.Jean.B.IreneB.C.IreneC.D.TheD.
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A.地址总线,数据总线B.系统总线,I/O总线C.PCI总线,EISA总线D.同步总线,异步总线
A.只能采用同步定时方式B.只能采用异步定时方式C.既能采用同步定时方式,也能采用异步定时方式D.不能直接通信
A.ⅠB.ⅡC.ⅢD.Ⅰ、Ⅱ
A.64MBpsB.132MBpsC.264MBpsD.528MBps
People can lose their hearing at any age before they are born,as infants,during childhood,or as【C1】______.Each age of onset has a different name and the deafness may have different【C2】______.Prenatal deafness means that a baby is born deaf.There are several reasons【C3】______this can happen.If parents are deaf,they may have a deaf baby.There are genes【C4】______deafness that hearing parents can also【C5】______on to their child.Other prenatal【C6】______of deafness can include:accidents;medicine or drugs that the mother takes;illnesses;and genetic syndromes.Genetic syndromes are a group of characteristics that a child【C7】______from its parents.There are two very common types of genetic syndromes related to deafness.One is Waardenburg’s Syndrome.Its characteristics are very【C8】______.Theperson may have pigment (色素)【C9】______:a streak (条纹)of white hair;two different color eyes;or streaks of white in a man’s【C10】______.It is【C11】______to have the physical traits of Waardenburg’s Syndrome but not be deaf.Usher’s Syndrome is also fairly【C12】______.Children with Usher’s Syndrome are born with a hearing loss and later lose their【C13】______.The first symptoms of this genetic syndrome【C14】______at【C15】______A person with Usher’s Syndrome will【C16】______problems seeing well in the dark.Later,they will lose their peripheral (外围的)vision and see only within a tunnel area in front of them.This is called ’tunnel vision.’Persons may eventually lose more and more of their vision and become blind or【C17】______blind.If you notice that a(n)【C18】______person does not see you when you stand at his or her【C19】______,that person may have this syndrome.The best way to communicate with a person who has Usher’s Syndrome is to stand directly in front and to sign【C20】______.
A. adultsB. friendsC. relativesD. students
A.一次总线传输只能有一个主设备和一个从设备B.一次总线传输可以有多个主设备和多个从设备C.一次总线传输可以有多个主设备,但只能有一个从设备D.一次总线传输只能有一个主设备,但可以有多个从设备
A.合子B.配子C.孢子母细胞D.游动孢子
A.二体雄蕊B.单体雄蕊C.多体雄蕊D.四强雄蕊
A.总线时钟频率B.总线宽度C.支持的总线事务个数D.是否是突发传送
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