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【单选题】
三点校正紫外分光光度法测定维生素A醇含量时,采用的溶剂为（）A.
水
B.
环己烷
C.
甲醇
D.
丙醇
E.
异丙醇
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反馈参考答案：
举一反三
【简答题】轴承是用来支承( )及轴上零件,以保证轴的旋转精度,减少轴与支承面间的摩擦和磨损。
【单选题】It is frequently assumed that the mechanization of work has a revolutionary effect on the lives of the people who operate the new machines and on the society into which the machines have been introduc...
A.
textile mills
B.
private households
C.
offices
D.
schools
【单选题】It is frequently assumed that the mechanization of work has a revolutionary effect on the lives of the people who operate the new machines and on the society into which the machines have been introduc...
A.
The effects of the mechanization of women's work have not borne out the frequently held assumption that new technology is inherently revolutionary.
B.
Recent studies have shown that mechanization revolutionizes a society's traditional values and the customary roles of its members.
C.
Mechanization has caused the nature of women's work to change since the Industrial Revolution.
D.
The mechanization of work creates whole new classes of jobs that did not previously exist.
【单选题】It is frequently assumed that the mechanization of work has a revolutionary effect on the lives of the people who operate the new machines and on the society into which the machines have been introduc...
A.
The effects of the mechanization of women's work have not borne out the frequently held assumption that new technology is inherently revolutionary.
B.
Recent studies have shown that mechanization revolutionizes a society's traditional values and the customary roles of its members.
C.
Mechanization has caused the nature of women's work to change since the Industrial Revolution.
D.
The mechanization of work creates whole new classes of jobs that did not previously exist.
【单选题】It is frequently assumed that the mechanization of work has a revolutionary effect on the lives of the people who operate the new machines and on the society into which the machines have been introduc...
A.
textile mills
B.
private households
C.
offices
D.
schools
【单选题】It is frequently assumed that the mechanization of work-has a revolutionary effect on the lives of the people who operate the new machines and on the society into which the machines have been introduc...
A.
textile mills
B.
private households
C.
Offices
D.
schools
【单选题】_____ has assumed a place among the great documents of human freedom.
A.
The Emancipation Proclamation
B.
The Homestead Act
C.
The Declaration of Independence
D.
Lasissez-faire policy
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