我国的《公路沥青路面再生技术规范》建议水泥等活性填料一般不超过（）
A.1%
B.1.5%
C.2%
D.2.5%
参考答案：B
已知a+b=4，c-d=-3，则（b+c）-（d-a）的值为[ ]
A.7
B.-7
C.1
D.-1
The nurse is about to administer a medication to a client with whom the nurse is unfamiliar. To verify the client’s identity, the nurse should（）
A. ask the client his name.
B. check the name posted outside the client’s room.
C. ask a family member the identity of the client.
D. check the client’s identification bracelet.
