一张旧圆桌的桌面直径是1m,李大爷准备修理一下这张圆桌.他打算在圆桌边缘钉上铁皮,给圆桌的正面刷上油漆.问一张旧圆桌的桌面直径是1m,李大爷准备修理一下这张圆桌.他打算在圆桌边缘钉上铁皮,给圆桌的正面刷上油漆.问:李大爷至少要准备多长的铁皮?这张圆桌需要刷油漆的面积有多大?
In case that the total export volume is larger than the total import volume, the balance is called ()or favorable trade balance.
通过聚合函数SUM(),求出炸天帮名单中所有人的总成绩