因为除法与分数之间是除号相当于分数线，除法中的被除数相当于分数的分子，除法中的除数相当于分数的分母；
所以a÷b=ab；
故判断：正确．
I was just about to jump into the river________the guide stopped me saying "Dangerous".[ ]
A. while
B. when
C. if
D. because
脊髓炎临床有哪些分类
