阀座与阀球相接触面的密封必须可靠,其真空度应保证在()。
A.70~40kPa
B.70~120kPa
C.70~80kPa
D.70~lOOkPa
参考答案:D
填入适当的词。
1. There a new chair and two sofas.
2. There some cakes and some rice.
3. Today is my mother's birthday .It's a birthday gift my mother.
4. It's time get up.
5. It's time dinner.
6. you like PE?
7. It's time for English. Take your English book.
8. We do everything English.
9. They art and music.
10. What do we have breakfast?
在产程中正确的是()
A.胎膜破裂后,羊水清亮,可嘱孕妇下床活动,以加速产程
B.胎膜破裂后,除观察羊水有无胎粪污染外,还应立即听胎心
C.胎膜多在宫口近开全时自然破裂
D.胎先露为头时,羊水粪染为胎儿窘迫,应立刻行刮宫产
E.胎膜破裂后,羊水清亮,无需听胎心