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【多选题】
复方氨基酸注射液的生产主要存在两个方面的问题:一个是澄明度差,另一个是稳定性差,所以生产中要( )A.
反复精制原料
B.
通入 N 2
C.
加入抗氧剂
D.
加入羧甲基纤维素钠
E.
调节 pH 值
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【简答题】阅读理解。 'It's over! Thank goodness!' School was over and I was tired. I sat at the front of the school bus. Janie, the driver, always tries to break the uncomfortable atmosphere (气氛) by talking. I try t...
【简答题】若角α 的终边经过点P(-3,4),则 的值是( )
【单选题】On February 3,1956,Autherine Lucy became the first African-American student to attend the University ofAlabama,although the dean of women refused to allow Autherine to live in a university dormitory. ...
A.
She moved into a dormitory.
B.
She sat in the front row of her class.
C.
She became terrified of the white rioters.
D.
She was befriended by an assistant to the university president.
【单选题】A questionnaires is sent to a selected number of students who sit accountancy exams across a wide range of countries. They are selected by randomly picking a number of students from each country, in p...
A.
Stratified
B.
Cluster
C.
Systematic
D.
Multi-stage
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