问题
问答题 简答题
什么叫雷暴日和雷暴日小时？
答案
参考答案：
在进行电力线路防雷设计时，必须考虑该地区雷电活动情况及地区雷电活动频率，可用雷电日或雷电小时表示，雷电日是一年中有雷电的日数，雷电小时是一年中有雷电的小时数，不论每日雷电发生几小时均按一个雷电日计算，由于每年雷电日变化较大，所以我们一般用多年的平均数。
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什么叫雷暴日和雷暴日小时？
参考答案：
在进行电力线路防雷设计时，必须考虑该地区雷电活动情况及地区雷电活动频率，可用雷电日或雷电小时表示，雷电日是一年中有雷电的日数，雷电小时是一年中有雷电的小时数，不论每日雷电发生几小时均按一个雷电日计算，由于每年雷电日变化较大，所以我们一般用多年的平均数。
完形填空。 Tony is four years old. His (1) name is Brown. (2) father and mother (3) doctors .They are very busy and Tony is (4) home alone . Tony likes drawing very much. He often draws dogs, cocks, foxes and flowers (5) the floor or on the wall. One afternoon, Tony’s mother buys brushes and many books for (6). Tony is very happy. After supper his (7) watch TV, but he begins to draw carefully at the table. “ (8) do you draw , Tony ?” asks his father . “God(上帝) ,” the (9) answers. “But we can’t (10) God and what does God look like?” “When I finish drawing, you will know about it,” says the little boy .
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