简述TBA22纸路。

水质检验项目中的化学指标共有20项，下列指标中，属于化学指标的是（）

A.化学耗氧量

B.阴离子洗涤剂

C.氯化物

D.铬（六价）

E.浑浊度

一个长方体相邻的两个面如果都是正方形，那么这个长方体一定是正方体。[ ]

D

Any mistake made in the printing of a stamp raises its value. A mistake on one inexpensive postage stamp has made the stamp worth a million and a half times its original (本来的) value. The mistake was made more than a hundred years ago in the British colony (殖民地)of Mauritius, a small island in the Indian Ocean. In 1847 an order for stamps was sent to a London printer—Mauritius was to become the fourth country in the world to issue (发行) stamps.
Before the order was delivered(传达), a party was planned at Mauritius’Government House, and stamps were needed to send out the invitations. A local printer was told to copy the design for the stamps. He printed the words " Post Office " instead of " Post Paid " by mistake on the several hundred stamps that he printed.
Today there are only twenty-six of these misprinted stamps left—fourteen Onepenny Orangereds and twelve Twopenny Blues. Because of the Twopenny Blue’s rareness (稀少) and age, collectors have paid as much as $ 16800 for it.

The best title for this selection is ______.

A．The "Post Office" Mistake

B．The Twopenny Blue

C．A London Printer’s Mistake

D．How Maurius Became Famous

道德的评价标准是（）。

A.利益标准

B.政治原则标准

C.法律条文标准

D.善恶标准

E.生命质量标准

频率合成包括（）、（）、（）、（）和（）5个基本功能。