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问题 单项选择题

下列甲状腺癌，哪一种最常出现砂粒体？（）

A.滤泡性癌

B. * * 状腺癌

C.髓样癌

D.未分化癌

E.鳞状细胞癌

答案

参考答案：B

解答题
（理）已知双曲线
x2
a2
-
y2
b2
=1(a＞0，b＞0)的两个焦点分别为F1，F2，P为双曲线上一点，满足
PF1
•
PF2
=0，|
PF1
|=2|
PF2
|．
（Ⅰ）求双曲线的离心率；
（Ⅱ）过点P作直线分别与双曲线两渐近线交于Q，R两点，当
OQ
•
OR
=-
27
4
，2
PQ
=-
PR
时，求双曲线的方程．
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选择题

The calculations, had they been done by hand,        all practical value by the time they were finished. [ ]

A. had lost      

B. would lose  

C. should have lost  

D. would have lost
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