The "quota system" is a system which ( ).

Which of the following explains the essence of quota sampling?

(I) If a sample is selected using random sampling, it will be free from bias.<br/>(II) A sampling frame is a numbered list of all items in a sample.<br/>(III) Cluster sampling is a non-probability sampling method.<br/>(IV) In quota sampling, investigators are told to interview all the people they meet up to a certain quota.<br/>Which of the above statements are true? A: (I),(II) ,(III) and (IV) B: (I), (II) and (IV) only C: (I) and (Il) only D: (I) and (IV) only

以下关于quota命令的说法，正确的有

关于伏羲资源调度quota机制描述正确的是？( )

使用 quota 可以让用户指定硬盘的储存限制，这包括：

An increase in the demand of the imported commodity subject to a given import quota will reduces the domestic quantity demanded of the commodity.

quota中inode是限制用户的（）。 A: 块 B: 目录 C: 字节 D: 文件

Assume the United States adopts a tariff quota on steel in which the quota is set at 2 million tons, the within-quota tariff rate equals 5 percent, and the over-quota tariff rate equals 10 percent. Suppose the U.S. imports 1 million tons of steel. The resulting revenue effect of the tariff quota would accrue to:（  ） A: The U.S. government only B: U.S. importing companies only C: Foreign exporting companies only D: The U.S. government and either U.S.   importers or foreign exporters

RedHatLinux9.0中的DNS使用的软件是（）。 A: qmail B: apache C: bind D: quota