影响X线产生的因素,不包括A.靶物质 B.管电流 C.管电压 D.焦点面积 E.高压 发布时间:2017-06-20 21:20 │ 来源:www.tikuol.com 题型:单项选择题 问题: 影响X线产生的因素,不包括A.靶物质B.管电流C.管电压D.焦点面积E.高压波形
题型:单项选择题 Wang Hui and Daming are good ___1___. Daming is __2__ Beijing and Wang Hui ___3__from Shanghai. __4___ are twelve years old. Daming is ___5 _ Class Two. Wang Hui is in __6____, too. Their English teacher is Miss Li. __7___ is a good teacher. Daming ___8___ football and Wang Hui likes basketball. Wang Hui can swim, but Daming __9___. Look ! Daming is __10___ football. Wang Hui is playing basketball .小题1:A.teachersB.friendsC.sistersD.brothers小题2:A.atB.inC.toD.from小题3:A.comeB.comesC.is comeD.coming小题4:A.theyB.TheyC.HeD.She小题5:A.inB.onC.atD.under小题6:A.Class TwoB.Class One C.class oneD.class two小题7:A.HeB.HerC.ItD.She小题8:A.likeB. likesC.likingD.is like小题9:A.canB.don’tC.can’tD.isn’t小题10:A.playsB.playingC.playD.Playying 查看答案
题型:单项选择题 关于生产性粉尘,错误的论述是A.生产性粉尘直径一般在0.1~10μmB.粉尘分为有机粉尘、无机粉尘和混合性粉尘三类C.粉尘被机体吸人多少与分散度的高低有关,分散度愈高的粉尘被机体吸人的机会也愈多D.能够进入肺泡的主要是直径小于5/μm的尘粒(石棉尘除外)E.粉尘对人具有刺激、中毒、致敏、致纤维化作用 查看答案