釉基质的主要成分是
A.酶
B.釉蛋白
C.鞘蛋白
D.釉原蛋白
E.以上都不是
参考答案:D
Do you think a wife should _____ her habits and tastes to those of her husband?
A.comply
B.confirm
C.consent
D.conform
脑梗死急性期宜慎用或不用()
A.抗凝治疗
B.扩血管治疗
C.脑保护治疗
D.降纤治疗
E.溶栓治疗