1.安装锯条时,锯齿应( )。
A. 向前
B. 向后
The Metro Trains of Chengdu Metro Line 3 is Type B and its classification is 6-car unit.
A. 对
B. 错
The Metro Trains of Chengdu Metro Line 5 is Type B and its classification is 8-car unit.
A. 对
B. 错
The Metro Trains of Chengdu Metro Line 1 is Type A and its classification is 6-car unit.
A. 对
B. 错