玻璃离子粘固粉充填时,洞型要求除外()。
A.窝洞要有一定深度
B.不必要求固位洞形
C.洞缘要求做洞斜面
D.洞缘可保留无基釉
E.窝洞底可呈圆弧形
参考答案:C
. _______ his mother, the baby could not help _______.
A.To see ;to laugh
B.Seeing ; to laugh
C.Seeing ;laughing
D.To see ;laughing
A cat fur, paws and a tail. [ ]
A. have
B. has
C. is