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问题
填空题
圆x
2
+y
2
﹣2x﹣2y+1=0上的动点Q到直线3x+4y+8=0距离的最小值为 ( )。
答案
2
选择题
This house ______ wood and it ______ Lu Ban.
A. is made of; was made by
B. was made in; was made of
C. is made from; is made by
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填空题
渐开线的形状取决于()圆。
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