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The numbers of the following traffic signs,which are axially

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The numbers of the following traffic signs,which are axially symmetric,are
The least natural number whose digits sum equals 100,is
At 10:30,the angle less than 180 formed by hour hand and minute hand of a normal clock is
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最好附上答案.
1.以下交通符号的数字中,轴对称的是()
2.加起来的和为100的自然数至少要几个?
3.10点30分时,一个普通闹钟上的时针和分针形成的小于180度的角度是()