I ______________ the violin at home yesterday. [ ]
A. play
B. played
C. plays
答案:B
以下关于金属烤瓷冠基底冠的描述中错误的是()
A.应与预备体密合
B.支持瓷层
C.金瓷衔接处为刃状
D.金瓷衔接处避开咬合区
E.唇面为瓷层留出0.8~1.2mm间隙
王冰《重广补注黄帝内经素问》是我国现存最早的《内经》注本,杨上善《黄帝内经太素》是又较大影响的《素问》注本