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问题 单项选择题

上市公司设（），负责公司股东大会和董事会会议的筹备、文件保管以及公司股东资料的管理，办理信息披露事务等事宜。

A.董事会秘书

B.董事长

C.监事长

D.董事助理

答案

参考答案：A

单项选择题

The most popular organic gem is the pearl. A pearl is the response of a marine mollusk to the presence of an irritating impurity accidentally introduced into its body; a cultured pearl is the result of the intentional insertion of a mother-of-pearl bead into a live mollusk. Whether introduced accidentally or intentionally, the pearl-making process is the same: the mollusk coats the irritant with a substance called nacre. Nacre is composed chiefly of calcium carbonate. Because very few natural pearls are now on the market, most pearls used in fine jewelry are cultured. These include "Biwa" pearls and most other freshwater pearls. Cultured pearls are not easily distinguished from natural pearls except by an expert.

Nacre is a substance that is________.

A．mechanically manufactured

B．the result of laboratory testing

C．organically secreted by the mollusk

D．present in the chemical composition of freshwater pounds
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单项选择题

基础压实作业，振动轮的宽度和直径应选取（）的数值。

A.较大

B.适中

C.较小

D.最小
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