慢支并发阻塞性肺气肿患者,主要表现为在原有症状基础上又出现
A.反复感染发热
B.反复发绀
C.咳多量脓痰
D.逐渐加重的呼吸困难
E.剧烈咳嗽
参考答案:D
Would you please keep silent? The news that the milk contains a harmful chemical _________and I want to listen.
A.has been broadcast
B.is being broadcast
C.is broadcast
D.is broadcasting
为预防机泵抱轴,要采取的措施有()。
A.定期更换润滑油
B.保证冷却水畅通
C.保证润滑油油位正常
D.确保密封泄漏达到要求