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【简答题】
已知方程 . (1)当满足 1 时,表示焦点在x轴上的椭圆; 当满足 2 时,表示焦点在y轴上的椭圆; 当满足 3 时,表示椭圆; (2)当满足 4 时,表示焦点在x轴上的双曲线; 当满足 5 时,表示焦点在y轴上的双曲线; 当满足 6 时,表示双曲线。 (请将A、B、C、D、E、F分别填入对应空格) A.mn<0 B.m>0,n<0 C.n>0,m<0 D.m>n>0 E.m>0,n>0且m≠n F.n>m>0
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举一反三
【单选题】(73) is the first line of protect between your computer and the public Internet.
A.
The Internet protocol
B.
The firewall
C.
The anti-virus software
D.
The intrusion-detection systems
【简答题】Choose the best answer for each of
the following questions according to Text B. Which is
not mentioned as a merit that the Internet brings to people in the first
paragraph?A. People can easily get inf...
【单选题】20100273(73) is the first line of protect between your computer and the public Internet.
A.
The Internet protocol
B.
The firewall
C.
The anti-virus software
D.
The intrusion-detection systems
【单选题】Which of the following statements about the Internet is true?
A.
ARPA was the first net used by American universities and institutions.
B.
The history of the Internet can be traced back to fifty years ago.
C.
The purpose of the Internet is to protect the world in the event of war.
D.
ARPAnet formed the foundation of the Internet nowadays.
【简答题】城市轨道交通场站综合开发范围内的用地,应当根据城市轨道交通建设进度()、()、()。
【单选题】Which company was the first to advertise on the Internet?
A.
ATT
B.
McDonald's
C.
Sony
【简答题】当你想表达自己想成为一名科学家时,可以这样说: “ _______________________________________________________________________________________.
【单选题】() is the first Iine of protect between your computer and the public Internet.
A.
The Internet protocol
B.
The firewall
C.
The anti-virus software
D.
The intrusion-detection systems
【单选题】Which pf the following used the Internet first?
A.
Hospitals.
B.
Universities.
C.
Banks.
D.
The government.
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