A:6 18
B:5 18
C:5 17
D:6 17
双链DNA分子中正确的碱基配对方式是( )
如图,点A、C、F、B在同一直线上,CD平分∠ECB,FG∥CD.若∠ECA=58°,则∠GFB的大小为____ °.
—I don't know. I have to look it up in the dictionary,