在一张长80厘米，宽62厘米的铁皮上剪下一个最大的圆．这个圆的半径是______．
62÷2=31（厘米）．
故答案为：31厘米．
Owing to her balanced diet and regular exercise, she is very slim and athletic _____.
A．in height
B．in shape
C．in detail
D．in sight
我二期锅炉水冷壁管全部采用螺纹管。
