剖面图只画剖切到的部位,对于远处能见到的部位不画,断面图与此相反
查看答案
基因表达的调控可以在多个环节上进行。其中microRNA(微RNA)所调控的环节是()
A. DNA水平
B. 转录水平
C. 转录后加工
D. 翻译水平
安全带应低挂高用,并防止摆动,不能将钩直接挂在安全绳上,应挂在连接环上。
A. 正确
B. 错误
These are the principles, however formulated,()all good men and women throughout the world are standing.
A. which
B. for which
C. in which
D. by which