防爆门的白铁皮（）检查一次，如果发现变薄、变形或损坏，立即更换。 A.每班 B.每天 发布时间：2019-03-03 20:22 │ 来源：www.tikuol.com 题型：单项选择题 问题： 防爆门的白铁皮（）检查一次，如果发现变薄、变形或损坏，立即更换。A.每班B.每天C.每周D.每月
题型：单项选择题 完形填空。 People _1_ at the moon and written poems about it for thousands of years, but nobody expected togo _2 1961 when Yuri Gagarin made the first manned space flight. Then the Americans decided to send a man to the moon . Apollo 11 took off _3_ 16 July , 1969. The moon is 238,900 miles from Earth and the journey _4 _ four days . On 21 July, Neil Armstrong 5_ the first man to walk on the moon. The astronaut in the pictures of the first moon landing isn't Neil Armstrong. The photos show the second man to walk on the moon , Buzz Aldrin. That's _6 Armstrong took the photos ! There were six manned missions to the moon between 1969 and 1972 , and 12 people _7_ on the moon . No astronauts have been to the moon _8_ 1972. We've learnt a lot about the moon becauseof these missions. For Example, we know that there's no life there. _9_ has ever lived on the moon, butsome scientists think that people will live on the moon one day . Life on the moon 10 easy. It will be a difficult and dangerous place to live.( )1. A. looked ( )2. A. in ( )3. A. on ( )4. A. is ( )5. A. become ( )6. A. why ( )7. A. have walked ( )8. A. in ( )9. A. Something ( )10. A. is B. look B. until B. in B. was B. becomes B. because B. walked B. since B. Everything B. was C. are looking C. before C. at C. took C. was becoming C. for C. walk C. for C. Nothing C. will be D. have looked D. after D. of D. liked D. became D. like D. will walk D. after D. Anything D. won't be 查看答案
题型：单项选择题 类风湿关节炎A．关节病变呈游走性，可同时侵犯较多关节，反复发作后逐渐变成关节畸形B．关节病变主要在滑膜，然后波及关节软骨和骨组织，反复发作后可并发心脏瓣膜疾患C．关节软骨变性是出现最早也是最主要的病理改变D．关节炎呈多发、对称性，滑膜炎是最早、最主要的病变E．关节病变主要发生于滑膜、关节囊、肌腱、韧带的骨附着电点，易发生钙化， 查看答案