某份试卷按百分制计分,现用再测法来考察测验的信度,应计算两次测验分数的()
A. 积差相关
B. 等级相关
C. 点双列相关
D. 列联相关
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The credit of letter will be confirmed by the Bank of China, Shanghai, that will _______your draft on the documents at sight for the amount of your invoice.
A. accept
B. pay for
C. receive
D. obtain
Many international companies produce a large number of products, often divided into product________.
A. categories
B. mix
C. brands
D. lines
经济利润等于()
A. 销售收入减去会计利润
B. 销售收入减去机会成本
C. 企业总收入减去会计利润
D. 企业总收入减去会计成本
一个性能优良的试题,其区分度指数的取值必须()
A. 大于 0.40
B. 大于 0.60
C. 在 0.6 至 0.8 之间
D. 在 0.8 至 1.0 之间