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危险单位承保限额，指保险公司对每一危险单位所能承受、并作为赔偿损失的最低责任的数额()。

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将叉形(两叉)网络变成等值非叉形(见图6-3)，已知。x1＝5,x2＝10,x＝15，则,为()。

Eddie was a carpet fitter, and he hated it. 【C1】 ten years he had spent his days sitting, squatting, kneeling 【C2】 crawling on floors, in houses, offices, shops, factories and restaurants. Ten years of his life, cutting and fitting carpets 【C3】 other people to walk on, 【C4】 even seeing 【C5】 . When his work was done, no one ever appreciated it. No one ever said "Oh, that's a beautiful job, the carpet fits so neatly". They just walked all over it. Eddie was sick of it.
He was especially sick of it 【C6】 this hot, humid day in August, 【C7】 he worked to put the finishing touches to today's job. He was just cutting and fixing the last edge on a huge red carpet which he had fitted in the living room of Mrs. Vanbrugh's house. Rich Mrs. Vanbrugh, who changed her carpets every year, and always bought the best. Rich Mrs. Vanbrugh, who had never even given him a cup of tea all day, and who made him go outside when he wanted to smoke. Ah well, it was four o'clock and he had nearly finished. At least he would be able to get home early today. He began to day-dream about the weekend, about the Saturday football game he always played for the local team, where he was known 【C8】 "Ed the Head" 【C9】 his skill 【C10】 heading goals from corner kicks.
【C1】__

列出S7-300PLC脉冲定时器各引脚的名称

某路基填筑施工至软土区段，项目部制定的该区段基底开挖方案中注意事项如下：(1)基底开挖用推土机、挖掘机或人工直接清除至路基范围以外堆放；深度超过3m时，要由端部向中央，分层挖除，并修筑临时运输便道，由汽车运载出坑。
(2)软土在路基坡脚范围以内全部清除。路基穿过沼泽地只需要清除路基坡角范围以内的软土。护坡道以外，对于小滑塌的软土，可挖成1:l～1:2的坡度。
问题：
(1)改正项目部制定的该区段基底开挖方案中注意事项的错误。
(2)进一步补充完善上述注意事项。