窦房结作为心脏的正常起搏点是因为
A.0期去极化速度最快
B.4期自动去极化速度最快
C.静息电位水平最低
D.没有明显的平台期
E.有最大舒张电位
参考答案:B
—Why do you like football?
—Because I think it's ______. [ ]
A. boring
B. different
C. difficult
D. interesting
固本健阳丹功效与作用