增大风量和筛下补水量,都可以提高松散度。
参考答案:对
—Where is Zhang Hua? Is he in the classroom now?
—He be there, for I saw him in the teachers’ office just now.
A.can’t
B.may not
C.shouldn’t
D.mustn’t
含牙囊肿囊壁附着在()
A.牙冠中1/3
B.牙颈部
C.釉牙骨质界
D.根部
E.任何部位