题目:
In a retail store, the average (arithmetic mean) sale for month M was d dollars. Was the average (arithmetic mean) sale for month J at least 20 percent higher than that for month M ?()
(1)For month M, total revenue from sales was $3,500.
(2)For month J, total revenue from sales was $6, 000.
A.条件(1)充分,但条件(2)不充分.
B.条件(2)充分,但条件(1)不充分.
C.条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分.
D.条件(1)充分,条件(2)也充分.
E.条件(1)和条件(2)单独都不充分,条件(1)和条件(2)联合起来也不充分.
答案:
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参考答案:通过增加概念的内涵,以减少概念的外延的逻辑方法。即概念的限制就是从属概念过渡到种概念的逻辑方法。