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【简答题】
已知椭圆的中心在原点,焦点在y轴上,若其离心率为 1 2 ,焦距为8,则该椭圆的方程是______.
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【单选题】下面程序段执行后sum的值为()main(){ int i,sum; for(i=1;i<6;i++) sum+=i;}
A.
14
B.
不确定
C.
15
D.
0
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【单选题】向用户授予操作权限的T-SQL命令是( )。
A.
CREATE
B.
REVOKE
C.
SELECT
D.
GRANT
【简答题】(     )1. exhibit A. B. C. D. (     )2. announce A. B. C. D. (     )3. liquid A. B. C. D. (     )4. employ A. B. C. D. (     )5. question A. B. C. D.
【判断题】在借贷记账法下,不能设置共同性账户。 ( )A. 对 B. 错
A.
正确
B.
错误
【单选题】已知 为 3 阶非 零矩 阵,且满足 ,则( )
A.
时 的秩必为 1
B.
时 的秩必为 2
C.
时 的秩必为 1
D.
时 的秩必为 2
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【简答题】D1—question 1. A. About 4 years. B. About 5 years. C. About 2 years. D. About 3 years. D1—question 2. A. Body lotion. B. Hair gel. C. Shampoo. D. Hair conditioner.
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