上述哪项为温胆汤的组成部分()
A.竹茹
B.黄芩
C.枳壳
D.桔梗
E.天麻
参考答案:A
To everyone’s amazement now, technology ________ faster than most people can keep pace with.
A.is changing
B.will change
C.changes
D.has changed
给定关系模式R(U,F),U=A,B,C,D,E,F=B→A,D→A,A→E,AC→B,其候选关键字为 (40) ,则分解ρ=R1(ABCE),R2(CD)满足 (41) 。
A.ABD B.ADE C.ACD D.CD