如果向北走10m记作+10m,那么向南走15m记作______m.
“向北”和“向南”相反,若规定向北走10m记作+10m,则向南走15m记作-15m.
--- What do people wear when they go to the theatre?
--- Well, it isn’t very . People can wear anything they like.
A.formal
B.certain
C.modern
D.simple
利多卡因消除单向传导阻滞是因为
A.促进Na+内流B.促进K+外流C.抑制Na+内流D.抑制Ca2+内流E.抑制K+内流