题目内容

We know from the passage that______.

A. teaching is a product of the society's division of labor
B. enough salaries are necessary in making quality people become teachers
C. greater progress has to be made in teaching
D. It is important to be successful in teaching the young

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A. 0.1%
B. 0.15%
C. 0.2%
D. 0.25%

A. 是正的
B. 是负的
C. 具有递减的趋势
D. 等于该两种商品的边际效用之比
E. 是指消费者为保持原有的效用水平或满足程度不变的前提下，增加一单位某种商品的消费时，而需放弃的另一种商品消费数量

ANSI X.12
B. UN/EDIFACT
C. UCS
D. TCP/IP

A. 地高辛
B. β受体阻滞剂
C. 螺内酯(安体舒通)
D. 硝酸盐
E. 速尿