椎动脉造影常规标准体位应选
A.正位
B.水平侧位
C.正位+斜位
D.正位+水平侧位
E.水平侧位+汤氏位
参考答案:E
解析:椎动脉造影显示颅内血管常规标准体位是汤氏位+水平侧位。
两个圆内切,其中一个圆的半径为5,两圆的圆心距为2,则另一个圆的半径是______.
A year ago a company issued a bond with a face value of $1000 with an 8 percent coupon. Now the prevailing market yield is 10 percent. What happens to the bond The:()
A. bond is traded at a market price higher than $1000.
B. bond is traded at a market price less than $1000.
C. company has to issue a new 2 -percent coupon bond.