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【简答题】
PN结的单向导电性是指，当P区电位_______N区电位时，PN结截止，反之则PN结导通。
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举一反三
【单选题】According to the four leadership competencies, which of the following is not the skill of a leader?
A.
Dealing with daily issues and producing results.
B.
Recognizing the talents of others and giving them the knowledge and the tools they need to succeed.
C.
Nurturing and developing successors.
D.
Making macro-plans and ensuring results.
【简答题】公开招标是指采购人或其委托的政府采购代理机构以投标邀请书的方式邀请三家或三家以上特定的供应商参与投标的采购方式。（ ）
【单选题】政府采购方式中，邀请招标是指采购人或其委托的政府采购代理机构以投标邀请书的方式，邀请（ ）家或（ ）家以上特定的供应商参与投标的采购方式。
A.
2；2
B.
3；3
C.
5；5
D.
6；6
【判断题】Writing is perhaps not only the skill in which they are least proficient, but also the one for which they will have the least use, therefore it is indeed a bad idea to teach our students the so-called...
A.
正确
B.
错误
【单选题】Which writing skill is NOT employed in this passage?
A.
Comparison.
B.
Contrast.
C.
Exemplification.
D.
Definition.
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