Economists assume that most people take risks______.
A. because doing so is exciting
B. only when they have no riskless alternative
C. very infrequently
D. if they are compensated for taking the risks
According to the optimal portfolio theory, where should portfolios lie？______.
A. Under the efficient frontier
B. Above the efficient frontier
C. On the efficient frontier
D. Anywhere, as long as the portfolio is diversified
下列燃气管道，宜采用清管球进行清扫的是()。
A. 球墨铸铁管
B. 长度＜100m钢管
C. 公称直径≥100mm钢管
D. 聚乙稀管
社会主义法制的基本要求是()
A. 法律面前人人平等
B. 有法可依,有法必依,执法必严,违法必究
C. 将社会主义民主制度化、法律化
D. 普及法律教育,增强公民法制意识
微信支付 
支付宝支付