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【判断题】
排气管的作用是引导气体的进入和排出。A.
正确
B.
错误
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举一反三
【单选题】I didn’t hear you, because I ________ yesterday’s football game.
A.
watch
B.
am watching
C.
watched
D.
was watching
【单选题】–Pardon? I didn’t hear you just now. –I asked .
A.
that Michelle Obama came to China in March
B.
how long did Michelle Obama stay in China
C.
when did Michelle Obama visit Chengdu
D.
who Michelle Obama came to China with
【单选题】. —___ I didn’t hear you clearly. It’s too noisy here. —I was saying that the party was great.
A.
Repeat.
B.
Once again
C.
Sorry?
D.
So what?
【简答题】教育属于混合产品,基础教育应由( )投资,高等教育应由( )投资。
【简答题】---Pardon? I didn’t hear you just now. ---I asked . that Michelle Obama came to China in March how long did Michelle Obama stay in China when did Michelle Obama visit Chengdu who Michelle Obama came t...
【多选题】关于扑热息痛生产工艺中第二步对亚硝基苯酚的还原反应,说法正确的有:
A.
硫化钠应投过量,若硫化钠不足,很有可能存在大量的还原中间态。
B.
投料方式为:把对亚硝基苯酚慢慢加入到盛有硫化钠溶液的还原罐中去。
C.
反应温度控制在38~50℃为好,若高于55℃,易发生氧化的副反应,若低于30℃,则反应不完全。
D.
加硫酸中和析出时, pH为10时产物基本游离,pH为8时析出少量硫磺,中和到7~7.5时,有硫化氢有毒气体产生,因此,调节pH必须考虑加酸速度。
【单选题】Sorry, I music just now, so I didn’t hear you me.
A.
was hearing; call
B.
heard; called
C.
listened to; called
D.
was listening to; call
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