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【多选题】
化学降阻剂的基本原理（ ）A.
降阻剂电阻远远小于接地电阻，分布周围相当于扩大了接地体直径
B.
降阻剂附着力强，消除接地体与土壤的接触电阻
C.
有些降阻剂吸水性保水性好
D.
降阻剂改变当地土壤性能
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举一反三
【单选题】回溯法求解0-1背包问题时,第i层的左儿子是否可行所用约束函数为( )。
A.
cw+w[i]<=c
B.
cw<=c
C.
cp>=bestp
D.
cp+v[i]>=bestp
【简答题】口腔扁平苔藓的典型病理表现为 ________、 ________ 、及____________。
【判断题】You will always hear 2 speakers in Section 1, and they will have an everyday conversation.
A.
正确
B.
错误
【单选题】Section A Directions: In this section, you will hear three conversations. At the end of each conversation, you will hear one question. Both the conversations and the questions will be spoken only once...
A.
The teacher always gets angry at this students for not doing her homework.
B.
It is unusual for the students not to do her homework.
C.
The student gets to do her homework all the time.
D.
The student has a lot of homework to make up.
【简答题】请简述城乡结合部居民区的超市的商品定位 。
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