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【单选题】
反相色谱法中,以甲醇和流动相,增加甲醇的比例,组分的保留时间 t R 将如何变化( )。A.
增大
B.
减小
C.
不变化
D.
无规律
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举一反三
【单选题】I'm ______ whether or not to go to Greece for the summer.
A.
on second thoughts
B.
on the spot
C.
in the process
D.
in two minds
【单选题】听力原文：W: Hey, Bob, guess what? I’m going to visit Quebec next summer. I'm invited to go to a friend's wedding(19) , but while I'm there, I'd also like to do some sightseeing. M: That's nice, Sherry. Bu...
A.
To go boating on the St. Lawrence River.
B.
To go sightseeing in Quebec Province.
C.
To call on a friend in Quebec City.
D.
To attend a wedding in Montreal.
【单选题】听力原文：W: Have you ever been to America? M: No, but I will go there this summer holiday. Q: What will the man do this summer holiday? (17)
A.
He will go to America.
B.
He will go to work.
C.
He will go to see his grandpa.
【多选题】安东尼.贝茨的教育媒体利用与选择观点有()
A.
媒体一般是灵活的和可替换的
B.
教学媒体只是一种手段
C.
不存在某种“超级媒体”
D.
媒体在传授知识方面的功能是相近的
【单选题】--Would you like to visit Kun Ming by yourself this summer vocation? --I’m not sure. I _____go there with my parents because of the terrible thing at the railway station.
A.
may
B.
must
C.
can
D.
should
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