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【单选题】
已知数列{ }是公差为2的等差数列，且 成等比数列，则 为A.
B.
C 2 D 3
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举一反三
【单选题】There is a new type of small advertisement becoming increasingly common in newspaper classified columns. It is sometimes placed among “situations vacant”, although it does not offer anyone a job, and ...
A.
informs job hunters of the opportunities available
B.
promises to offer useful advice to those looking for employment
C.
divides available jobs into various types
D.
informs employers of the people available for work
【简答题】硬盘存储器是一种().A. 外存储器 B. 内存储器 C. 主机的一部分 D. 数据通信设备