中国军人保障的管理主体包括()
A、军队政治与后勤机关
B、政府民政等主管部门
C、企业
D、社会团体
参考答案:A, B
Parents often ask their children _____ their Internet friends because they may be in danger.
A.to meet
B.to not meet
C.meeting
D.not to meet
GTR膜放置时,应超过骨缺损边缘至少
A.2~3mmB.3~4mmC.5mmD.6mmE.1mm