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【简答题】
已知M（-3，0）﹑N（3，0），P为坐标平面上的动点，且直线PM与直线PN的斜率之积为常数m（m≥-1，m≠0）． （1）求P点的轨迹方程并讨论轨迹是什么曲线？ （2）若 m=- 5 9 ，P点的轨迹为曲线C，过点Q（2，0）斜率为k 1 的直线? 1 与曲线C交于不同的两点A﹑B，AB中点为R，直线OR（O为坐标原点）的斜率为k 2 ，求证k 1 k 2 为； （3）在（2）的条件下，设 QB =λ AQ ，且λ∈[2，3]，求? 1 在y轴上的截距的变化范围．
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举一反三
【单选题】听力原文：What is it called if a letter of credit is issued for guarantee of performance rather than payment? (3)
A.
Back-to-back credit.
B.
Reciprocal credit.
C.
Documentary credit.
D.
Stand-by credit.
【单选题】172 Fixed-price and incentive-type contracts place responsibility for performance and financial risks associated with delay or non-performance on the:
A.
Buyer
B.
Third party
C.
Contractor
D.
All of the above
E.
None of the above
【单选题】A benefit performance is a performance for which a charitableorganization has bought out at a discounted price and _____ funds by sellingtickets at a full price.
A.
furnishes
B.
raises
C.
accumulates
D.
contributes
【单选题】Fixed-price and incentive-type contracts place responsibility for performance and financial risks associated with delay or non-performance on the:
A.
Buyer
B.
Third party
C.
Contractor
D.
All of the above
E.
None of the above
【简答题】performance-price ratio
【单选题】The bidders shall furnish a performance bond () than 2% of the total bid price.
A.
not lest
B.
no more
C.
not much
D.
no less
【单选题】benefit performance is a performance for which a charitable organization has bought out at a discounted price and ___ funds by selling tickets at a full price.
A.
furnishes
B.
raises
C.
accumulates
D.
contributes
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