单项选择题
A.n1+n2=n0 B.n1+n2=2n0 C.n1-n2=n0 D.n1=n2=n0
A.便于换档 B.减速增扭 C.传动系过载保护 D.平稳起步
A.差速差扭 B.不差速差扭 C.不差速不差扭 D.差速不差扭