固定式杆式泵工作时()。
A.工作筒不动,活塞作往复运动
B.活塞不动,工作筒作往复运动
C.活塞与工作筒同时作往复运动
D.活塞与工作筒都不运动
参考答案:A
Afraid ______ face before his students, the teacher refused ______ that he was in the wrong. [ ]
A. to lose; to admit
B. of losing; admitting
C. of losing; to admit
D. to lose; admitting
以下不是休克性肺炎临床表现的为()
A.尿量增多
B.血压下降、脉压减小
C.四肢厥冷、出冷汗
D.面色苍白、烦躁不安
E.不发热或仅有低热