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【单选题】
用酸碱滴定法测定阿司匹林含量时,使用酚酞指示液,用氢氧化钠滴定液(0.1mol/L)进行滴定,滴定终点时溶液的颜色是( )A.
紫红色
B.
粉红色
C.
粉红色褪去
D.
蓝绿色
E.
蓝色
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】Please write out the structure of text in mind-gaping(be sure all paragraphs are included in, main ideas of each paragraph are better. )
【单选题】已知1%(g/ml)枸橼酸钠溶液的冰点降低值为0.185摄氏度,其等渗溶液的百分浓度是
A.
2.85%（g/ml）
B.
2.91%（g/ml）
C.
2.95%（g/ml）
D.
2.98%（g/ml）
E.
2.81%（g/ml）
【简答题】Who designed the first helicopter(直升机)? Who _____some of most famous pictures in the world? Who knew more about the human body than most ______of his time? There is an answer ______ all these question...
【单选题】In the pictures, who is the basketball player in yellow, and which team does him play for?
A.
Yao Ming, Rockets.
B.
Kobe, Lakers.
C.
Yao Ming, Lakers.
D.
Kobe, Rockets.
【单选题】已知1%( g/ml)枸橼酸钠溶液的冰点降低值为0. 185℃，计算其等渗溶液的百分浓度是
A.
2.4(%g/ml)
B.
2.6(%g/ml)
C.
2.8(%g/ml)
D.
3.0(%g/ml)
E.
3.2(%g/ml)
【单选题】已知1%(g/ml)枸橼酸钠溶液的冰点降低值为0.185°C,计算其等渗溶液的浓度是
A.
2.4(％g／ml)
B.
2.6(％g／ml)
C.
2.8(％g／ml)
D.
3.0(％g／ml)
E.
3.2(％g／ml)
【简答题】Listening to the ________ carefully, you will have a good understanding of the main ideas of the lecture as well as the structure of the lecture.
【单选题】What do we call the person who draws the pictures in the book?
A.
illustrator
B.
author
C.
character
D.
none of the above
【简答题】Who are the celebrities in the pictures?
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