硅胶薄层板使用前在110℃加热30分钟,这一过程称为()
A.去活化
B.活化
C.再生
D.饱和
E.平衡
参考答案:B
China has been developing rapidly since its foundation, but as is known to us, she is still a country _____
the Third World. [ ]
A. belongs to
B. belonged to
C. belonging to
D. to belong to
吃什么东西对抗辐射效果好?