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【多选题】
催化裂化等装置所产的液化气和干气,除烷烃、烯烃等主要成分外,还有( ) 、二硫化物等硫化物和二氧化碳、氮气、氧等杂质,硫化物对装置设备有腐蚀作用 :H2S 有剧毒危害人身安全,这些杂质必须从液化气中去除。A.
H2S
B.
硫醇
C.
硫醚
D.
硫酸
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【单选题】The company has an excellent ___________ for high-quality leather shoes.
A.
performance
B.
reputation
C.
image
D.
business
【简答题】Listen and complete the conversation. A: Good morning. My name is John Smith. I’m an (1 ). B: How do you do, Mr. Smith? My name is Zhou Hong. (2 ) my card. A: Nice to meet you, Ms. Zhou. We’ve le...
【简答题】在滴定分析中,滴定终点与理论上的化学计量点不可能恰好符合,它们之间的误差称为 。
【简答题】For more than 10 years,the company has built an excellent reputation among customers at home and abroad for its quality products and superior service.
【单选题】UK vs. USA Education SystemAccording to the world university rankings compiled by the Times Higher Education, more than half of the world’s top 200 universities are located in either the US or the UK....
A.
Degree programs in the US take about one year longer than programs in the UK.
B.
Degree programs in the US take about one year shorter than those in the UK.
C.
Courses of study are shorter in the UK.
D.
(This is not an answer.)
【简答题】在滴定分析中，根据指示剂变色时停止滴定的这一点称为______。实际分析操作中滴定终点与理论上的化学计量点不可能恰好符合，它们之间的误差称为______。
【简答题】在滴定分析中,指示剂变色时停止滴定的这一点称为 。实际分析操作中滴定终点与理论上的化学计量点不可能恰好相符,它们之间的误差称为 。
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