合成氨工业中,热交的作用是什么?
参考答案:热交的作用是利用合成反应后的高温气体预热反应前的冷气体。
Just then the police radio says there was a robbery(抢劫) in a supermarket nearby. The police told Mr. Brown to stay there and they would be back soon. Then the police ran to the supermarket.
Mr. Brown didn’t wait but drove home. When he got home, he was tired and went to bed. Mrs. Brown found a police car in front of their house and the lights were still on.
根据文章选择最佳答案。
小题1:Mr. Brown went to _______.
A.work
B.watch a game
C.a party
D.the movies小题2:Mr. Brown went home _______.
A.on foot
B.by car
C.in his friend’s car
D.by taxi小题3: Mr. Brown met _______ on his way home.
A.a robbery
B.his friend
C.Mrs. Brown
D.the police小题4: There was a robbery _______.
A.in a supermarket nearby
B.in a supermarket far away
C.in a shop nearby
D.in a shop far away小题5: At last, Mr. Brown _______ to go home.
A.walked
B.drove his own car
C.ran
D.drove a police car
胍乙啶的降压机制
A.奎尼丁B.利多卡因C.普萘洛尔D.维拉帕米E.阿托品