【单选题】下列新制备出的氢氧化物沉淀在空气中放置,颜色不发生变化的是
【单选题】下列选项中,加点通假字有误的一项是 ( )
【单选题】下列新制备出的氢氧化物沉淀在空气中放置,颜色不发生变化的是
【简答题】听句子,选出该句的最佳答语。 ( )1. A. They're over there. ( )2. A. You're welcome. ( )3. A. How are you? ( )4. A. Yes, they do. ( )5. A. Have you seen him? B. No, it isn’t. B. I’m sorry to hear ...
【单选题】–I won the first prize in English Writing Competition. --_____________.
A.
I’m sorry to hear that.
【单选题】---You’d better read more English magazines to improve your reading. ---______________
A.
Why don’t you read it?
D.
I’m sorry to hear that.
【单选题】3,3,3-三氟丙烯 与HCl 反应,产物是( )
【单选题】3,3,3-三氟丙烯 与HCl 反应,产物是( )
【单选题】—This is a really wonderful party with interesting people and great food . —I’m _____ to hear that you are enjoying yourself. [ ]
【单选题】下列新制备出的氢氧化物沉淀在空气中放置,颜色不发生变化的是( )。