为什么尿素装置循环冷却水回水管道上都装有安全阀?
参考答案:
(1)防止高压介质(尤其是气体)漏入时及时泄压,以保证设备管道安全;
(2)便于判断检查及设备泄漏,及时检修。
The tall man was sitting in the chair. He was reading a book. When I talked to him, I found that from boyhood (少年时代), he had the habit (习惯) of carrying a little book in his pocket. He often read every minute when he was not doing anything else. He found a book very useful during the time of waiting, such as waiting for meals, buses, doctors, telephone calls, plays to begin or something to happen.
That was how he found his fifteen minutes a day for reading.
That was how he read his twenty books a year --one thousand in his lifetime.
小题1:The habit of carrying a book was the habit of ________.
A.the writer
B.the man
C.the pocket
D.the boyhood小题2:When the man was waiting for the doctor, he _______.
A.talk with others
B.found something to eat
C.read a book
D.wanted to know who the doctor was小题3:Sometimes the man read in the theatre, because ________.
A.the play was not interesting
B.the play didn't begin
C.the play was over
D.the man didn't like the play
休克期()
A.血压变化不大而脉压缩小
B.血压明显下降而脉压更小
C.全身广泛出血倾向及内脏出血
D.精神烦躁不安,伴有代谢性酸中毒
E.无血压,无脉搏,尿量20ml/h左右