正方形的周长是C，边长是______．
根据正方形的周长公式可得：边长=周长÷4，即C÷4=C4．
故答案为：C4．
---Where you put my dictionary?
---I left it on your desk when you to Tom.
A．did; spoke
B．have; were speaking
C．had; were speaking
D．had; spoke
独立尺寸链是什么？
