当发生气侵关井后,天然气到达井口时,作用于井底压力达到()。
A、最小
B、最大
C、不变
参考答案:B
根据句意和汉语提示,在空白处填入适当的单词。
1. —What's the news about? —It's about Hangzhou Bay Bridge, the world's ________ (最长的) sea bridge.
2. ________ (尽管) it didn't snow heavily, temperatures have fallen sharply since then.
3. A powerful earthquake hit Wenchuan in ________ (西南方) China's Sichuan province on May 12th.
4. —Do you know the song "Love in Beijing"? —Sure. It is _________ (演唱) by Son Nan, a well-known
Chinese singer.
5. Finally help reached the flood victims in the damaged village _________ (成功).
垃圾回收再利用是世界性的潮流和时尚,推广“分类垃圾箱”的好处有( )
①使一部分非可再生资源得以再利用
②减少固体废弃物的污染
③减少占用人们的生活空间
④减少大气污染,保护臭氧层
⑤美化城市街道环境
A.①②③⑤
B.②③④
C.①②④⑤
D.①②③浏览答案