汽车自动变速器类型液力机械自动变速器(AT)、机械自动变速器(AMT)、()。
参考答案:无级变速器(CVT)
Wu baoguo , a teacher from the mountain , devoted all his life ______ children . [ ]
A. educate
B. to educate
C. to educating
D. to education
动火时对动火作业人员有何要求?