肺心病心力衰竭时可出现以下常见症状和体征，除了（）
A.颈静脉怒张
B.水肿
C.肝肿大和压痛
D.尿少
E.咳粉红色泡沫状痰
参考答案：E
The teachers were always trying to ______ the excited students at that time.
A．calm down
B．set down
C．let down
D．turn down
送料呆滞的故障原因有哪些及消除方法？
