【多选题】在断开蓄电池负极之前,需要做的准备工作有
【判断题】为加快胶料凝固速度,需要在滴胶均匀化后放入烘箱加温固化,70°C烘90分钟,再水平放置,直到胶完全固化。
【单选题】根据材料,回答题。 New Changes in American Life Once it was possible to define male and female roles easily by the division of labor. Men worked outside the home and earned the income to support their families...
A.
In addition, many Americans did not value the traditional male role of soldier.
B.
Most of them still took traditional women's jobs as public school teaching, nursing, and secretarial work.
C.
These roles were firmly fixed for most people, and there was not much opportunity for women to exchange their roles.
D.
But its influence spread to many parts of American society.
E.
The people involved in this movement did not Value the middle-class American goals.
F.
A great many jobs that used to belong to men are now taken by women.
【单选题】维生素C具有很强的还原性,以下说法正确的是
【单选题】维生素C是具有还原性的弱酸,因此具有很强的( )
【简答题】To remain__in the local market, the quality of our products needs to be improved.
【多选题】在断开蓄电池负极之前,需要做的准备工作有( )。(II)
【单选题】By the phrase 'held back' in Para. 1, the author means ______.
A.
made to remain in the same classes
B.
forced to study in the lower classes
C.
drawn to their studies
D.
prevented from advancing