边长为2cm的正六边形面积等于cm2．_爱下问搜题

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问题填空题

边长为2cm的正六边形面积等于 cm²．

答案

解：正六边形的边长为2cm，

由于正六边形可分成六个全等的等边三角形，

且等边三角形的边长与正六边形的边长相等，

所以正六边形的面积

单项选择题

Questions 14-22

·Look at the ten statements for this part.
·You will hear apassage about "Credit Cards History ". You will listen to it twice.
·Decide whetheryou think each statement is right(R), wrong(W) or not mentioned(NM).
·Markyour answers on the Answer Sheet.

The concept of credit cards was introduced by a man with no college education.

A．Right

B．Wrong

C．Not Mentioned

判断题

机械法尘密封面是靠垫片的弹性变形所需的压紧力来实现的。