洁净室的排风系统设计中,防室外空气倒灌的措施不宜采用( )。 A.止回阀 B.调 发布时间:2018-01-28 07:05 │ 来源:www.tikuol.com 题型:单项选择题 问题: 洁净室的排风系统设计中,防室外空气倒灌的措施不宜采用( )。A.止回阀 B.调节阀 C.中效过滤器 D.密闭阀
题型:单项选择题 读一读,选出正确的单词填空。1. What ___________ (does / do) your family like to do?2. We go to the ___________ (park / restaurant) to have supper.3. My cousin ___________ (have / has) a car. He drives to school.4. My father is 34 years old. I am 10. I'm ___________ (older / younger) than him.5. How many people in my family wear ___________ (a glass / glasses). 查看答案