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【简答题】
什么叫短路冲击电流 i sh 和 I sh ?什么叫短路稳态电流 I K ?为什么高、低压电网中计算 i sh 和 I sh 的关系式不同?
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举一反三
【单选题】What had been the principal use of the antlers?
A.
To help in removing trees and bushes to cultivate the land.
B.
To obtain the material for useful tools.
C.
To prepare the fields for fanning.
D.
To make many artifacts useful in dally life.
【单选题】Most of the deserts ______ to be covered with bushes and trees. [ ]
A.
used
B.
were used
C.
use
D.
got used
【单选题】The cat padded across the road and towards the bushes just _______ the hornbeam trees, and she stopped.
A.
except for
B.
apart from
C.
beyond
D.
from
【单选题】The island had______.
A.
a lot of vegetation but no trees, bushes or flowers
B.
rio vegetation(植物) or wildlife
C.
plentiful supplies
D.
a few birds and animals
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