【简答题】Please watch and listen unit 6 task 1, then fill in the blanks below. F: Just now we learned the key words “___1______ “ and “___2___”, Hazard can cause risk and risk can lead to ___3___. But I know...
【单选题】乙醇俗称酒精,在下列有关乙醇性质的描述中,属于化学性质的是( )
【判断题】E y 大的电对的氧化型物种一定能氧化 E y 小的电对的还原型物种。
【单选题】关于氧气,下列说法错误的是()。
A.
氧气在常温常压下是一种无色、无臭、无味、无毒的气体
C.
在0℃和1atm(101 325Pa)下氧气密度为1.43kg/
【简答题】(可选题) Watch the video and put the missing words or phrases on the blanks. vedio视频.mp4 Attendant: We 1 for you a wonderful 2 ... with a 3 and ... May I have your 4. ? Elise: Yes. Attendant: Thank y...