[多选题]以下是组合电器的汇控柜及二次回路的全面巡视内容的是()
A.箱门应开启灵活，关闭严密，密封条良好，箱内无水迹
B.箱体透气口滤网完好、无破损
C.二次电缆绝缘层无变色、老化或损坏，电缆标牌齐全
D.光纤完好,端子清洁,无灰尘

{{B}} Agitated Sunspot Cause Trouble{{/B}}
If the lights in your house keep flickering, blame frequent sunspots.
A sunspot is actually charged particles flying at the speed of 3 million kilometers an hour out of the surface of the sun to form sun storms.
{{U}} (1) {{/U}}
The earth, which is directly energized by the sun, is influenced by sun storms in a number of ways.
{{U}} (2) {{/U}}Wireless short-wave communication, which depends on the wave’s reflection against this layer of atmosphere, is likely to be jammed. It is said that mobile phone communication may be affected too.
{{U}} (3) {{/U}}According to a research conducted by the Russian scientists from 1957 to 1960, the frequency of earthquakes can be linked to the movement of the sunspots.
Though little research has been carried out about how exa