给定关系R(A1,A2,A3,A4)上的函数依赖集F={A1A3→A2,A2→A3),R候选关键字为(1)。分解p={(A1,A2),(A1,A3)} (2)。
A1A3
B. A1A2A3
C. A1A3A4
D. A2和A1A3
急性危重哮喘发作时如需静脉滴注糖皮质激素,最好选用
Which of the following $1 000 face-value securities has the highest yield to maturity?______.
A 5% coupon bond selling for $1 000
B. A 15% coupon bond selling for $1 000
C. A 10% coupon bond selling for $1 000
D. A 15% coupon bond selling for $900