在区间使用轻型车辆及小车时，轻型车辆运行中有何要求？
参考答案：
须显示停车手信号，并注意瞭望。
I often reply to his blog only to show my of his thoughtfulness .
A．achievement
B．agreement
C．attention
D．appreciation
管径有时也用英制尺寸表示．如DN25相当于公称直径为（）的管子。
A.1/2in
B.3/5in
C.3/4in
D.1in
