The cost performance index（CPI） is the ratio of earned value to （） and can be used to estimate the projected cost of completing the project.
A. cost variance
B. planned cost
C. planned cost
D. actual cost
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Most operating systems have a standard set of （） to handle the processing of all input and
A. spreadsheet
B. control instructions
C. I/O operation
D. data table
Which of the following techniques is NOT typical of Gertrude Stein s？
Automatic writing
B. Minimalist style
C. Frequent use of repetition and reiteration
D. Circular movement in story-telling
The first American to win the Nobel Prize for Literature was a sharp social critic, whose
A. Sinclair Lewis
B. Thomas Steams Eliot
C. Ernest Hemingway
D. William Faulkner
在OSI 参考模型中，物理层的功能是：（）。
A. 建立和释放连接
B. 透明地传输原始比特流
C. 在物理实体问传送数据帧
D. 发送和接受用户数据
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