贵金属基底冠表面修磨时用哪种磨头最好
A.碳化硅砂石
B.氧化铝砂石
C.金刚砂磨头
D.钨钢钻
E.以上均可
参考答案:D
解析:贵金属基底冠表面修磨时用钨钢钻最好。
The famous film star looked so handsome in his new clothes that we took _____ pictures of him. [ ]
A. many of
B. masses of
C. a great deal of
D. a plenty of
炒谷芽的功能是()
A.消食和中
B.健脾消食
C.消食止泻
D.补脾止泻
E.补脾和胃