工业射线照相用的像质计大致有（）
A.金属丝型像质计
B.孔型像质计
C.槽型像质计
D.以上都是
参考答案：D
Liu Li has ______ interesting book. And ______ book is from her parents. [ ]
A. a , a
B. a, the
C. an, the
怎样培养学生的良好性格？
