管道图中常见的各种字母如R、φ、i和d都表示什么意义?
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在保证船舶日常操作需要的前提下,所设置的通道数应()
A. 减至最少
B. 越多越好
C. 10个以上
D. 视情而定
Each fireman’s outfit and its spare equipment on a vessel must be stowed().
A. in a locked cabinet in the machinery space
B. in an unlocked cabine in the machinery space
C. in a separate and accessible location
D. at a fire hydrant locatio
10kV及以上电压等级供电的客户,当单回路电源线路容量不满足负荷需求且附近无上一级电压等级供电时,可合理的增加供电回路数,采用多回路供电。
A. 正确
B. 错误