急性心脏压塞的主要特征
A．颈静脉怒张
B．Beck三联征
C．听诊心音减弱
D．触诊脉搏减弱
E．收缩期血压下降，舒张压不变
参考答案：B
— Have you been here before?
— Yes. This is the third time that I ______ to Shanghai.
A．come
B．came
C．have come
D．had come
卧床病人更换床单法的评价
