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【单选题】
硅胶吸附柱色谱常用的洗脱方式是A.
极性梯度洗脱
B.
碱性梯度洗脱
C.
酸性梯度洗脱
D.
洗脱剂的极性由大到小变化
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A.
Have a conversation with my teacher.
B.
To learn the grammatical structures.
C.
Teachers correct my pronunciation.
D.
I learn the rules of affixes.
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【单选题】A topic sentence should show a point not a line to focus on. Which sentence is a standard topic sentence?
A.
My mother has passed along to me rules for getting along with others.
B.
Exercise is beneficia to your heart.
C.
In my life, I have read many books.
D.
He can fix a bicycle himself.
【多选题】法压壶制作咖啡中:
A.
粉水比例可采用1:15到1:20,推荐1:16到1:18
B.
研磨度 研磨至很粗砂糖的颗粒
C.
水温 92-96摄氏度
D.
萃取时间 3-5分钟
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