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【简答题】

Osaka (大阪) was Japan’s greatest commercial city in ancient times and is the city with Japan’s biggest castle (城堡).Modern Osaka is a good place to see commercial and industrial Japan.The castle is the most interesting tourist attraction in the city.It was built in 1586.The easiest way to get to Osaka is on the world-famous bullet train(新干线)from Tokyo,which travels over 210 kilometers per hour.It is said to be the cleanest train in the world.

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题目标签:干线大阪
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【多选题】在TN—C供电系统上,某电气设备采用铜线接零保护(同时有照明装置)和干线铝线连接时采用铝管压接。这天杨某上班打开设备照明灯开关,但灯不亮,当他接触到电机金属构架时突然触电。当其他工人上班发现时已死亡。请分析出造成此事故的原因是()。

A.
该电气设备内部绝缘损坏而漏电,金属构架带电
B.
因错误地使用铝套管压接铜、铝导线,时间长而烧断,保护接零失效
C.
线路没有装置漏电保护装置,或漏电装置失效、
D.
应采用三相五线制供电