马克思在他创办并担任主编的《新莱茵报》上，十分重视撰写（） A.通讯 B.社论 C.

教育过程中的师生关系是知识授受的关系。（ ）

— What do you think of teaching, Bob?

— I find it fun and challenging. It is a job _____ you are doing something serious but interesting. [ ]

A. where

B. which

C. When

D. that

You ___ do it even if you don't want to. [ ]

A. can't  

B. mustn't  

C. have to  

D.needn't

牙折裂达龈下，影响修复治疗（）

A.牙龈成形术

B.牙冠延长术

C.根向复位瓣术

D.引导性组织再生术+植骨术

E.截根术

喷射钻井技术要求钻井泵压必须大于（）MPa，喷射速度要大于（）m/s，环空上返速度要小于（）m/s。