断路器控制柜应密封良好，内部清洁干燥，在环境温度低于（），湿度较大时应投入加热器。
A. 15℃
B. 10℃
C. 5℃
D. 0℃
查看答案
A vessel is equipped with cross-connected deep tanks. In which situation should the cross-connection valve be closed? （）
A. The tanks lie above the waterline and are filled
B. The tanks are partially filled with dry cargo
C. The tanks are partially filled with liquid cargo
D. The tanks are filled and lie below the waterline
提速道岔可动心轨实际尖端至翼轨趾端的距离（简称尖趾距离）为2396mm，容许误差为0，+25mm。
A. 正确
B. 错误
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