牙周塞治剂的主要作用是()
A.保护作用
B.止痛作用
C.止血作用
D.固定作用
E.充填作用
参考答案:A, B, C, D
— _do you study for your math test?
—By working with my classmates or asking the teacher for help. [ ]
A. How
B. What
C. When
D. Why
易并发臁疮的疾病是()
A.气瘤
B.肉瘤
C.骨瘤
D.脂瘤
E.筋瘤