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【简答题】
已知点N（ 5 2 ，0），以N为圆心的圆与直线l 1 ：y=x和l 2 ：y=-x都相切． （Ⅰ）N的方程； （Ⅱ）设l分别与直线l 1 和l 2 交于A、B两点，且AB中点为E（4，1），试判断直线l与圆N的位置关系，并说明理由．
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皮皮学刷刷变学霸
举一反三
【单选题】The common opening of the alveoli is( )
A.
alveolar sac
B.
respiratory bronchiole
C.
pulmonary mesenchyme
D.
alveolar septa
E.
alveolar pore
【判断题】The Meridian Gate has five openings with the central passage reserved for the emperor alone.
A.
正确
B.
错误
【简答题】The full name of the USA is ( ).
【单选题】Which of the following is NOT true?
A.
The Americans think much about time.
B.
All Americans always have a deep love for time only.
C.
The Americans even value their spare time.
【简答题】Americans never tell others about their weight.
【简答题】The Meridian Gate, also known as _____________________(Five-phoenix Tower) is the main entrance to the Imperial Palace.
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