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【判断题】
计算机系统加电时,给主机加电,后给外部设备加电。
A.
正确
B.
错误
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【简答题】设中心在原点的双曲线与椭圆 +y 2 =1有公共的焦点,且它们的离心率互为倒数,则该双曲线的方程是 .
【单选题】What did the poll find out about wilfing?
A.
People under 25 were more likely to wilf than those aged 55 and above.
B.
Women confessed that wilfing damaged the relationship with their partners.
C.
Internet users spent no more than 30 percent of their Internet time wilfing.
D.
Women tended to spend more time wilfing on the Internet than men.
【简答题】设中心在原点的椭圆与双曲线2x 2 -2y 2 =1有公共的焦点,且它们的离心率互为倒数,则该椭圆的方程是(    )。
【单选题】What did Jim dream about? He dreamed about ______ .
A.
the zoo
B.
the train
C.
a big animal
【判断题】地陪应注意饭店客房住宿结算时间的规定(通常在下午2: OO之前),避免出现未按时退房的情况。P90
A.
正确
B.
错误
【单选题】What did the poll find out about wilfing( )
A.
People under 25 were more likely to wilf than those aged 55 and above.
B.
Women cinfessed that wilfing damged the relationship with their partners.
C.
Internet users spent no more than 30 percent of their Internet time wilfing
D.
Women tended to spend more time wilfing on the Internet than men.
【简答题】如图,椭圆 与椭圆 中心在原点,焦点均在 轴上,且离心率相同.椭圆 的长轴长为 ,且椭圆 的左准线 被椭圆 截得的线段 长为 ,已知点 是椭圆 上的一个动点. ⑴求椭圆 与椭圆 的方程; ⑵设点 为椭圆 的左顶点,点 为椭圆 的下顶点,若直线 刚好平分 ,求点 的坐标; ⑶若点 在椭圆 上,点 满足 ,则直线 与直线 的斜率之积是否为定值?若是,求出该定值;若不是,说明理由.
【简答题】设中心在原点的椭圆与双曲线2x 2 -2y 2 =1有公共的焦点,且它们的离心率互为倒数,则该椭圆的方程是______
【简答题】设椭圆的方程为(x2/16)+(y2/12)=1,则该椭圆的离心率为( )
【简答题】What conclusion did the most recent poll draw?
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