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【简答题】
如图，抛物线 y =－ x 2 +1与 x 轴的正半轴交于点 A ，将线段 OA 的 n 等分点从依次记为 P 1 , P 2 ,…, P n －1 ,过这些分点分别作x轴的垂线，与抛物线的交点依次为 Q 1 ， Q 2 ，…， Q n －1 ，从而得到 n －1个直角三角形△ Q 1 OP 1 , △ Q 2 P 1 P 2 ,…, △ Q n －1 P n －1 P n －1 ,当 n →∞时，这些三角形的面积之和的极限为 .
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【单选题】The comprehensive review of a contractor's technical performance, cost performance, and delivery schedule, is referred to as:
A.
post project evaluation
B.
post contract evaluation
C.
post mortem
D.
procurement performance evaluation
E.
contractor's performance evaluation
【简答题】已知某放大电路的电压放大倍数为 。 ( 1 )求解Aum,fL,fH ; ( 2 )画出波特图。
【单选题】63 The comprehensive review of a contractor's technical performance, cost performance, and delivery schedule, is referred to as:
A.
post project evaluation
B.
post contract evaluation
C.
post mortem
D.
procurement performance evaluation
E.
contractor's performance evaluation
【单选题】181 The comprehensive review of a contractor's technical performance, cost performance, and delivery schedule, is referred to as:
A.
post project evaluation
B.
post contract evaluation
C.
post mortem
D.
procurement performance evaluation
E.
contractor's performance evaluation
【单选题】The most important difference between a comprehensive review and an elementary review is _____.
A.
the number of words
B.
a systematic critique of the book
C.
the publication information
D.
the summary
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