球形伸缩器的优点是（）。 A.占地面积小，节省材料，不存在推力 B.制造方便，补偿能 发布时间：2019-02-21 01:51 │ 来源：www.tikuol.com 题型：单项选择题 问题： 球形伸缩器的优点是（）。A.占地面积小，节省材料，不存在推力B.制造方便，补偿能力大，轴向推力较大，维修方便，运行可靠C.装置简单、可靠D.安装简单，占地少
题型：单项选择题 完形填空。 Mary is an English girl. She is in Beijing now. She studies in our class and she is __1__ good friend. Today is Thursday. She __2__ up at six-ten. She has __3__ at seven-ten. After breakfast. she __4__ to school. She __5__ a math class at eight. History is her favorite__6__. She likes it __7__ she thinks it is very interesting. She eats lunch at school. At two-ten she has a P. F. class. Mr Green is heP. E. __8__ . She has baseball __9__ an hour. Mr Green is very strict but __10__ with. ( ) 1. A. I ( ) 2. A. gets ( ) 3. A. lunch ( ) 4. A. go ( ) 5. A. have ( ) 6. A. color ( ) 7. A. but. ( ) 8. A. teach ( ) 9. A. at ( ) 10. A. nice B. my B. get B. abreakfast B. goes B. having B. food B. because B. teaches B. on B. good C. me C. don't get C. breakfast C. get C. cloesn't has C. fruit C. or C. teacher C. of C. well D. he D. isi't get D. the lunch D. gets D. has D. subject D. with D. teachers D. for D. best 查看答案
题型：单项选择题 某男，14岁，恒牙牙合。第一磨牙开始远中牙合。上中切牙内倾，侧切牙唇倾。前牙闭缩合，Ⅲ度深覆牙合，上下切牙拥挤。如果选用方丝弓矫治器不拔牙矫治为了协助打开咬合可采用 （）A.后牙合垫B.Ⅱ类牵引C.口外弓D.上颌 * * 导E.N弓 查看答案