电子邮件系统由发送邮件服务器、接收邮件服务器、邮件中继、邮件网关和（）组成。
参考答案：邮件客户
可引起呼衰加重的是（）
A.机械通气过度
B.慢性呼吸衰竭合并休克
C.大量利尿剂
D.慢阻肺合并呼吸道感染
E.应用强心剂
— The concert was wonderful yesterday. Didn’t you go to it?
— _______. I _______, but I had to look after my sick baby at home.
A．No; would love to have
B．No; would love to
C．Yes; would love to
D．Yes; would love to have
