UPS电源的保护功能主要包括（）及输出过欠压保护等。A、输出短路保护 B、输出过载保 发布时间：2017-10-05 04:37 │ 来源：www.tikuol.com 题型：多项选择题 问题： UPS电源的保护功能主要包括（）及输出过欠压保护等。A、输出短路保护B、输出过载保护C、过温保护D、电池欠压保护
题型：多项选择题 完形填空 I took up skydiving in my twenties.At the time the accident happened, I'd done just 30 jumps.Theairfield was quiet when I __1__.On board were Chris, who was taking a tourist, and Ants, the cameraman.Chris indicated I should exit first and the other three would __2__.Later I knew it was this__3__ that saved my life. At 12,000 feet Chris rolled up the door and nodded that it was time for my exit.I put my foot on a step just beside the door, and in a(n) __4__ the propeller blast (螺旋桨气流) threw me against the __5__ of the plane, half in, half out.I pushed and got my other leg out of the door, but in doing so Ifound myself __6__ the body of the plane towards the tail.My parachute (降落伞) got caught and my __7__ and legs were pushed backwards, powerless, in the strong wind. I was strangely __8__.To a skydiver, being at 12,000 feet is a good thing.Altitude is your friend；being close to the ground is deadly and will kill you. Ants appeared and __9__ slowly towards me, his legs held by Chris in the door.Ants reached outand got hold of my foot.With the weight partly off, I found myself falling away from the plane, __10__freed.I waved and smiled to indicate I was fine. It was actually very __11__.If any one of a number of factors had been different, I would have __12__.I could have hit the plane with my head.If I had been the last to exit, the pilot alone would have been unable to free me, and even if he had been aware that I was __13__ underneath the plane, he would still have had to land at some point. Blue Skies, Black Death is the skydivers' mantra (咒语)．On the one hand, there's the freedom and __14__ of the open sky.But in order to __15__this joy, you must accept that there is usually only one result if something goes wrong.( )1. A. jumped ( )2. A. follow ( )3. A. trouble ( )4. A. minute ( )5. A. left ( )6. A. sliding down ( )7. A. body ( )8. A. frightened ( )9. A. ran ( )10. A. really ( )11. A. funny ( )12. A. died ( )13. A. attached ( )14. A. pride ( )15. A. observe B. arrived B. escape B. effort B. way B. right B. knocking over B. arms B. anxious B. moved B. hopefully B. ordinary B. laughed B. adjusted B. confidence B. experience C. woke C. leave C. chance C. instant C. top C. crashing into C. head C. excited C. stepped C. certainly C. clear C. stopped C. covered C. excitement C. imagine D. dove D. fly D. decision D. sense D. side D. leaning against D. fingers D. calm D. rushed D. finally D. serious D. returned D. connected D. willingness D. discover 查看答案