John goes to school ______ his friends' car. [ ]
A. by
B. in
C. at
D. on
答案：B
发电机定子线棒在槽内固定的方法有几种？
为邪正交争，疾病发展的转折点的是 ()
A．头汗
B．战汗
C．大汗
D．盗汗
E．自汗
