题目:
两圆的半径分别是3和4,圆心距是8,则这两个圆的公切线有( )条.
A.1
B.2
C.3
D.4
答案:
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One possible version: I get up at six o’clock. After breakfast, I go to school at half past seven. Then we often begin class at seven forty-five. At twelve we hav...