肾中精气的主要生理功能是()。
A.促进机体的生长发育
B.促进生殖功能的成熟
C.主生长发育和生殖
D.化生血液的物质基础
E.人体生命活动的根本
参考答案:C
已知{an}是等比数列,(a6+a10)(a4+a8)=49,则a5+a9等于( )
A.7
B.±7
C.14
D.不确定
The tools and techniques of quantitative risk analysis are ().
A.contracting,contingency planning,alternative strategies,and insurance
B.interviewing,historical results,workarounds,and additional response development
C.checklists,damage control reports,standard allowances, and inspection
D.data gathering and representation techniques,and quantitative risk analysis and modeling techniques