单项选择题

下列哪种埋在土壤的人工接地极不符合规范规定？

A.50mm2裸铜排
B.70mm2裸铝排
C.90mm2热镀锌扁钢
D.90mm2热镀锌角钢
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单项选择题
某座35层的高层住宅，长L=65m，宽W=20m，高H=110m，所在地年平均雷暴日为60.5d a,与该建筑相同雷击次数的等效面积为下列哪项数值？
A.0.038km2
B.0.049km2
C.0.058km2
D.0.096km2
未分类题
第二节 完型填空阅读下面短文，从短文后所给各题的四个选项(A、B、C和D)中选出能填入相应空白处的最佳选项。Here is some advice on food shopping. The 【B1】 family spends about one-sixth of its income 【B2】 fooD.Because food is expensive, it is important to spend the money 【B3】 when you shop. A careful shopper can prepare nourishing and delicious meals 【B4】 . Here are some tips to help you shop better.Buy only the food you neeD.There are several ways to avoid 【B5】 extra fooD.First, make a shopping list before you go to the storE.Then, when you are at the store, 【B6】 your list carefully. Furthermore, do not go shopping if you are hungry. When you are hungry, foods look very 【B7】 and you want to buy more than you neeD.【B8】 , go shopping alone if you can. If you shop with young children, they often ask you to buy them 【B9】 food like candy.When you have a 【B10】 , choose the least expensive brand of a product. There are three points to remember when you buy 【B11】 tomatoes, for examplE.First look at the advertisements in the newspaper to see if your supermarket is 【B12】 a 'special' on canned tomatoes. In addition, when you are in the store, you should check 【B13】 per pound of tomatoes. Sometimes you save money if you buy the larger size can; sometimes, 【B14】 , you do not. Third, remember that a grade A product or a more expensive product is not necessarily more healthful than a grade B or less expensive product. Grade A tomatoes may look 【B15】 , but all canned tomatoes have the same nutrients.Shoppers seem to have 【B16】 difficulties when they buy fresh fruits and vegetables. There are several things to consider when buying fresh foods. Because fresh foods 【B17】 if they are not used, you have to buy the correct amount 【B18】 the number of people you are serving. In addition, plan to use fresh foods that are in season because fresh foods that are generally less expensive then, 【B19】 choose fruits and vegetables that have a bright, fresh color. A good color is often a 【B20】 that the food has a lot of vitamins.【B1】A.averageB.singleC.plainD.usual
A.B.
C.
D.
【B1】
A.average
B.single
C.plain
D.usual
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