氧枪喷嘴就是压力、速度的能量转换器,也就是将()转化为低压高速的氧射流。
参考答案:高压低速气流
— I would like to take a five-day trip this May.
— ______. We are too busy to afford it. [ ]
A. Pardon me
B. Don't mention
C. Don't worry
D. Out of the question
董某,女,27岁。10个月前疲劳后双眼视力减退,约1个半月后恢复,近1个月前感冒后出现双下肢麻木无力、行走不稳,近1周来,出现视物双影,双眼视力0.4。
该病人的健康指导不正确的为()
A.避免疲劳和情绪激动
B.洗澡时避免水温过高
C.遵医嘱服药
D.3个月内避免妊娠
E.症状缓解、病情恢复后可像正常人一样学习、工作和生活