校验高电阻接地系统中电气设备接地线的热稳定时，温度70℃的允许载流量流经选定接地线的截面时，对于敷设在地下的接地线，应采用下列哪项电流？（）
A.流经接地线的计算用单相接地短路电流的50%
B.流经接地线的计算用单相接地短路电流的60%
C.流经接地线的计算用单相接地短路电流的75%
D.流经接地线的计算用单相接地短路电流的100%
参考答案：C
| 完形填空。 | ||||
| Mike always loves ships. When he was 1 , he said, "I'm going to go into the army," but his eyes were not very 2 , and he did not get in. Then he said, "I'm going to buy a small 3 , and I'm going to go around the world," but boats 4 very expensive, and Mike did not have 5 money. But last summer Mike found a swimming club (俱乐部) near 6 house. The lessons did not cost very much, and Mike began going to the club at every end of the week and 7 . Now he is a good swimmer. Last week a little boy said to him, "You're a very good swimmer. How do you learn to swim 8 ?" "I'm not good 9 all," Mike said and he smiled. "I'm in the water, and I say to myself, 'There are dangerous fishes in this area (地区)!' Then I'm very 10 , and I swim very quickly." | ||||
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