黄酮类化合物结构中,2,3位碳间有双键者是
A.黄酮
B.黄酮醇
C.二氢黄酮
D.异黄酮
E.二氢黄酮醇
参考答案:A,B,E
关于节俭,你能够认可的说法是()
A.节俭需因人而异,因个人或企业不同而有所区别
B.节俭绝不会促使企业增值,不应成为企业文化建设的内容
C.节俭是建设节约型社会的需要
D.会花钱才能挣钱,无须大力倡导节约
--- Can I have a talk with you at about 5 this afternoon, Mr.Smith?
--- All right, I ______ to my office from a conference then.I will be waiting for you there.
A.have come back
B.will come back
C.will have come back
D.will be coming back