A:what to work it out
B:what to work out it
C:how to work it out
D:how to work out it.
河北省环保局取缔了65家小造纸厂,每年减少5170.4吨废水和29.22万吨化学耗氧物质排入汉江。
判断:____;
理由:____。
325×1001=325325 736×1001=736736
判断对错.
正方形的周长是它的边长的4倍.