单选题
1分
Electrical supply is always needed even if only for lighting so after a ship goes into service it is...
Electrical supply is always needed even if only for lighting so after a ship goes into service it is extremely rare for the main bus-bars to be dead, it therefore follows that the bus-bars are continuously alive ___ the life of the ship.
参考答案: B
参考解析: 即使只用于照明,也需要供电。所以当船舶投入营运后,主汇流排不带电的情况及其罕见。由此可见,汇流排在船舶的整个使用期间都是带电的。