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【单选题】
设F 1 ，F 2 是双曲线 x 2 a 2 - y 2 b 2 =1 （a＞0，b＞0）的两个焦点，点P在双曲线上，若 P F 1 ? P F 2 =0 且| P F 1 || P F 2 |=2ac（c= a 2 + b 2 ），则双曲线的离心率为（ ）A.
1+ 5 2
B.
1+ 3 2
C.
2
D.
1+ 2 2
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【简答题】阅读理解 A. Photography Club-We are looking for artistically inclined students to join our new club.We plan to meet every Tuesday and Thursday evening after school from 6 to 8 pm.Each member must have the...
【单选题】螺杆泵的主动螺杆在三螺杆以上的泵中（），而从动螺杆不受扭转力矩的作用。
A.
受轴向力，受径向力
B.
不受轴向力，不受径向力
C.
不受轴向力，受径向力
D.
受轴向力，不受径向力
【单选题】Artistically, A Dream of Red Mansions is most praiseworthy for ______.
A.
its characterization
B.
Its length
C.
Its beauty
D.
Its romaticism
【多选题】In almost every garden, there is a large space in the garden set in a landscape of artistically arranged _________
A.
rockeries
B.
ponds and bridges
C.
pavilions
D.
trees, and flowers.
【单选题】What can we know about Anne Bancroft?
A.
She was most artistically unyielding.
B.
She was born in New York.
C.
Her forebears were Englishmen.
D.
She had changed her name before.
【单选题】She is ____________ to artistically and political provocative work, not financial gain.
A.
contemplated
B.
committed
C.
consumed
D.
contemped
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