试题与答案

老年人口系数下降,可使()。 A.病死率下降 B.婴儿死亡率下降 C.婴儿死亡率上升

题型:单项选择题

题目:

老年人口系数下降,可使()。

A.病死率下降

B.婴儿死亡率下降

C.婴儿死亡率上升

D.粗死亡率下降

E.粗死亡率上升

答案:

参考答案:D

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题型:单项选择题

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.

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