胆道闭锁,有哪些辅助诊断方法()
A.十二指肠插管引流
B.B超
C.腹腔镜
D.经皮肤穿刺胆管造影
E.放射性核素碘标记玫瑰红排泄试验
参考答案:A, B, C, D, E
(1)对任意x∈R,试比较x2+x+2与1-x的大小;
(2)已知函数f(x)=log3(x2+kx+2)的定义域为R,求实数k的取值范围.
If the threshold return is higher than the risk -free rate, what will be the relationship between Roy's safety -first ratio (SF) and Sharpe's ratio()
A. The SF ratio will be lower.
B. The SF ratio will be higher.
C. They will be the same.