答案:有关、鸣笛、操规第42条
A. (A)55—65
B. (B)65-75
C. (C)75-85
A. A.1400
B. B.1600
C. C.1800
解析:解析:1HKf(246、247)保证该开关均在前进位。)
A. (A)加大
B. (B)变小
C. (C)不变