两个圆C1：x2+y2+2x+2y-2=0与C2：x2+y2-4x-2y+1=0_爱下问搜题

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问题选择题

两个圆C₁：x²+y²+2x+2y-2=0与C₂：x²+y²-4x-2y+1=0的公切线有且仅有[ ]

A．4条

B．2条

C．3条

D．1条

答案

答案：B

填空题

选词填空。

capital house about naughty famous a bit

1. Parrot is a very _______ bird.
2. Lily is _______ shy.
3. Ottawa is the _______ of Canada.
4. This is Big Ben. It's very _______.
5. It's a book _______ London.
6. Is that your ________?

问答题简答题

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