射流具有()和(),在射流横截面上中心速度最大,在射流轴线上,超过等速核后,其速度迅速降低。
参考答案:等速核;扩散角
—Tomorrow is Sunday. What about going shopping together?
—I will go I’m free.
A. before B. if C. until
阻塞性睡眠呼吸暂停低通气综合征(OSAHS)患者,若睡眠时采用鼻腔持续正压通气,应注意将空气流速调至()
A.10L/min
B.50L/min
C.100L/min
D.200L/min
E.尽可能大