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【单选题】
下列关于角膜错误的说法是A.
有丰富的神经末梢
B.
有丰富的血管
C.
有作用
D.
角膜透明
E.
占外膜的前 1/6
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皮皮学刷刷变学霸
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【简答题】已知椭圆C： x 2 a 2 + y 2 b 2 =1 （a＞b＞0）与直线x+y-1=0相交于A，B两点． （1）当椭圆的半焦距c=1，且a 2 ，b 2 ，c 2 成等差数列时，求椭圆的方程； （2）在（1）的条件下，求弦AB的长度； （3）当椭圆的离心率e满足 3 3 ≤e≤ 2 2 ，且以AB为直径的圆经过坐标原点O，求椭圆长轴长的取值范围．
【简答题】. . . . . . . . . . . . . . . . . . . . . . . const i tutes any f inancial t ransact ions whose purpose is to conceal the or igins of the proceeds of criminal activity. Which word(s) completes ...
【单选题】Consumers enjoy a ( ) variety of similar items for less money.
A.
larger
B.
shorter
C.
longer
D.
faster
【简答题】free money that is awarded to students according to one’s high academic performance or f inancial need(B)
【单选题】Which of the following statement is NOT true?
A.
Consumers can enjoy more convenience as the cooperation between Internet companies and hardware makers develops.
B.
Yahoo is expected to cooperate with Google Inc. to provide Web services to the Nokia handset users.
C.
Nokia entered cooperation with Yahoo Inc. earlier than Motorola.
D.
Consumers need to wait for a period of time before their existing phones can be connected to the Internet.
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