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【简答题】
中性点直接接地系统（包括阻抗接地的系统）发生单相接地故障时，（）很大，所以这种系统称为大接地电流系统。采用中性点不接地或经消弧线圈接地的系统，当某一相发生接地故障时，由于不能构成短路回路， （）往往比（）小很多，所以这种系统称为小接地电流系统。
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举一反三
【单选题】关于痛经,下述正确的是
A.
原发性痛经生殖器官有器质性病变
B.
继发性痛经生殖器官无器质性病变
C.
多发于排卵型月经
D.
痛经常于行经前数天开始
E.
痛经者不能用解痉药
【单选题】Why does the professor discuss food and clothing?
A.
to show how money can be used to buy useful products
B.
to help illustrate the difference between durable and perishable items
C.
to show how the forms of money have changed over the years
D.
to contrast them with unfamiliar products
【单选题】关于痛经,下述正确的是
A.
原发性痛经生殖器官有器质性病变
B.
继发性痛经生殖器官无器质性病变
C.
多发于有排卵型月经
D.
痛经常于行经前数天开始
E.
痛经者不能用解痉药
【简答题】We had a w_________(极好的,精彩的)time last Sunday.
【简答题】In the past，hunting was necessity，with humans killing wild animaks for food and clothing ． However ， modern hunters generally hunt for one of two reasons：for sport，or because it’spart of their traditi...
【单选题】Although some boys in his situation to crime to get money for food and clothing, Louis never did.
A.
might have turned
B.
might be turning
C.
had turned
D.
will turned
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