契约法

Case law rule allows unilateral withdrawals of inadvertently erroneous bids from the bidder. U.S. federal procurement system, deriving from contracting law, permits bid correction or withdrawal before award and reformation or rescindment after award under certain circumstances.

於美国契约法下，判例上即允许投标厂商有主张单方计算错误而撤销契约，而美国联邦采购制度主要之规定均系依循美国契约法而来，亦在一定要件下允许厂商於决标前可更正投标或撤销投标；於决标后，亦可重新形成契约或撤销契约。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。