题目内容

3. All the following are principle or necessary parts of a business letter except______.

A. the Date
B. the Salutation
C. the Salutation
D. References No.

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2. In a business letter, a letterhead includes all the following information except______.

A. the sender’s name and address
B. website, and logo, if any
C. postal code and contact details
D. the recipient’s name

1. In a business letter writing, a greeting to the recipient is the______. B

A. signature
B. salutation
C. letterhead
D. inside name and address

在298K时，Ag2CrO4的Kspθ= 9.0×10—12。向4×10—5mol/LAgNO3溶液中加入等体积的4×10—3mol/L的K2CrO4溶液，结果无沉淀产生。

Zn+Fe2+ = Fe+Zn2+ 在298.15K，在标准状态下能正向自发进行[已知：φθ（Zn2+/Zn）= -0.762V，φθ（Fe2+/Fe）= -0.447V]。