A:wasn't strict with
B:wasn't satisfied with
C:wasn't proud of
D:wasn't surprised at
画一个直径为5厘米的圆,圆规两脚之间的距离是2.5厘米.
下列说法正确的是 ( )
回答下列有关生命活动调节的问题:
如图1是测量神经纤维内外电位的装置,图2是测得的动作电位变化.回答: