岩石研磨性
参考答案：
岩石磨损碎岩工具的性能。
-When do you have biology?
-__________.[ ]
A. On Monday and Thursday
B. In our school
C. Because it's fun
D. I like it very much
目前认为基因表达调控的主要环节是
A．基因活化B．转录起始C．转最后加工D．翻译起始E．翻译后加工
