不典型心绞痛需与下列哪项相鉴别（）
A.急腹症
B.膈疝
C.反流性食管炎
D.颈椎病
E.消化性溃疡
参考答案：B, C, D, E
简述注射剂一般的制备工艺流程。
As angry crowds got into the streets fighting for their basic rights, the local government______the police
to keep order.[ ]
A. called in
B. brought about
C. picked out
D. paid back
