控制系统为了防止感应除了安全接地的措施外另一措施是（）
A、去处潮湿
B、隔离
C、加强缓冲防止振动
D、防尘保护
参考答案：B
At first, it seemed that everything went well, but all of sudden, the ship hit
iceberg.
A．a; an
B．a; the
C．the; the
D．/; an
侧沟的深度和宽度均不应少于（）米。
