空气洁净度等级不同的相邻房间的静压差应大于(),洁净室与室外大气的静压差应大于()。
参考答案:5Pa;10Pa
Thirty years ago, I walked into a bakery and asked for some bread to sell. At that time, I was 12 years old. Luckily a g____小题1:___ lady saw me that day. She gave me some bread and w____小题2:____ me good luck.
I took the bread and went out to sell them. It took me all day, but I s____小题3:____ them all. At the end of the day, I had some money. I was the h____小题4:____boy in the world as I walked home that evening.
The next day, I went to a bike shop. I paid a deposit(定金) on a new bicycle.. And then I s____小题5:____ my next journey as a newspaper delivery(投递) boy. Soon I could pay the r____小题6:____ of the money for the bike and the bike was m____小题7:___. I was so proud of myself!
Today I continue w____小题8:____ in the delivery business. I have a lot of trucks to send goods all over the country. I live in a beautiful house, but I don’t ride a bicycle these days. I drive a large nice car.
I will n____小题9:____ forget that young lady. Because she gave me the start, I have become a successful man. I’d like to s____小题10:____ my thanks to her.
酒渣鼻的病因可能与()()()()()等有关