齿轮传动的传动比取决于( )。
A．主动轮转速
B．主动轮与被动轮齿数之比
C．被动轮与主动轮齿顶圆直径之比
D．被动轮与主动轮轴间距离
参考答案：B
1.What language _______ in Australia?2.The nurse in that hospital is very helpful. The children there _______ good care of by them. 3.The colour TV ________ in that shop three days ago. 4.Those books _______ by Ba Jin, a famous writer.
在农电生产系统中，工作票危险点模板中，危险点专业不包括以下哪一种（）
A.变电
B.线路
C.配电
D.电缆
