问题
多项选择题
下面属于双极保护的有（）。
A.站接地过流保护
B.转换开关保护
C.金属回线纵差保护
D.中性线开关保护
答案
参考答案：A, B, C
搜题请搜索小程序“爱下问搜题”
下面属于双极保护的有（）。
A.站接地过流保护
B.转换开关保护
C.金属回线纵差保护
D.中性线开关保护
参考答案：A, B, C
完形填空（共20小题，每小题1.5分，满分30分） Surrounded by rolling green hills dotted with horses and cows, the town of Waimea on Hawaii’s Big Island is a peaceful and friendly place. One afternoon, while staying with friends at their house there, my husband and I decided to go for a 36 along the many, mostly traffic-free, country lanes in the area. We met a beautiful Golden Retriever. He seemed 37 friendly so we stopped to play with him, 38 a stick which he retrieved(取回) several times happily. When we 39 our walk, he followed us, and although I worried that he 40 be going too far from his home, I couldn’t deny that we were enjoying his 41 . After about twenty minutes, we found ourselves walking along a dirt road in an unfamiliar area. One house, almost hidden by shrubbery(灌木林) and shaded by tall trees，seemed 42 strange. I felt an urge to be as far away from that place as possible. Just then, the door to the house creaked open and five dogs 43 , barking and growling as they ran toward us. I felt 44 and couldn’t move. There was nowhere to 45 and no time to run.. All of a sudden, our new friend appeared between the dogs and us. He faced them – all five of them – growling and baring his teeth. I was 46 to see the attacking dogs stop in their tracks ten feet away from him. Our protector 47 them there while we escaped. 48 a safe distance, we looked back and saw the five dogs 49 back toward their house. But the Golden Retriever was 50 in sight. I felt an ache in my 51 ; I missed our friend already. Instinctively, I knew he was not hurt. With a feeling of 52 , we made our way back to the house, 53 the whole way that we would see him again. But it was not to be. When I told our friend about the encounter, her eyes flew wide open 54 she exclaimed, “It was an angel!” To this day I have no 55 that a four-legged angel protected us.
|