题目内容

疗效是()

A. 计数资料(无序分类变量)
B. 计量资料(数值变量)
C. 等级资料(有序分类变量)
D. 总体中的个体
E. 无法判断

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要减少抽样误差,最切实可行的方法是 ()

A. 适应增加观察例数
B. 控制个体变异
C. 校正仪器、试剂、统一标准
D. 严格挑选观察对象
E. 考察总体中的每一个个体

What is essay?

Generally speaking, Bacon's literary style has three prominent qualities: brevity,compactness and forcefulness.

A. 对
B. 错

A good essayist should always express his thought with clearness and in as few words as possible.

A. 对
B. 错