From the Angle of wave motion optics, on the principle of Huyghens, explaining the light of refraction. Simplifying the picture of the light of refraction and then getting a simple drawing method.

从波动光学的角度，用惠更斯原理解释了光的折射现象，根据惠更斯原理所作的折射光线进行简化，得出较为简单的作图方法。

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Abstract: According to the co-existence of quota pricing and bill of quantity pricing, analyzes the differences of the two pricing patterns in valuation method and bidding by picture explaining.

[摘要]针对定额计价和工程量清单计价并存的局面，采用图释的方法剖析两种计价模式在计价方法和招投标上的区别。

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Abstract: According to the co-existence of quota pricing and bill of quantity pricing, analyzes the differences of the two pricing patterns in valuation method and bidding by picture explaining.

[摘要]针对定额计价和工程量清单计价并存的局面，采用图释的方法剖析两种计价模式在计价方法和招投标上的区别。

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