地球每个历史发展阶段，其表面都有一套相应的地层生成，各地域地层（）。

A.厚度相同

B.层数相同

C.一定相同

D.不一定不一样

A client on an inpatient psychiatric unit at a community mental health center is pacing up and down the hallway. The client has a history of aggression. Which response by the nurse would be best when approaching the client（）

A. "If you can’t relax, you could go to your room. "

B. "Would you like your antianxiety medication now"

C. "You’re pacing. What’s going on"

D. "Let’s go play a game of pool. "