峰电位
参考答案:
是一次短促而尖锐的脉冲变化,是细胞兴奋的标志。
—Can you imagine Mike across the Atlantic within a single day?
—We all imagine him a brave and determined person. [ ]
A. to sail; to be
B. sailing; being
C. to sail; being
D. sailing; to be
一般情况下,地铁内各种发热源产生热量的比例中,人员散发的热量大约占()。
A.50%
B.5%
C.30%
D.15%