去死因寿命表方法求得消除某种死因后的平均预期寿命的增量,综合说明()对人类寿命的影响
A.某种环境因素
B.某种死因
C.卫生状况
D.社会经济因素
E.遗传因素
参考答案:B
Which of the following aspects is not what an economic union concerns?()
A.common currency
B.harmonized tax rates
C.harmonized tax rate structures
D.common political policy