对无牙颌病人,若上、下颌骨关系正常,则上、下牙槽嵴的连线与平面的交角()
A.>60°
B.<60°
C.>80°
D.<80°
E.=70°
参考答案:C
Mr. Duncan raised an unnecessary question __________ he then failed to find an answer.
A.to which
B.for which
C.with which
D.by which
“疲劳、疼痛”属于()。
A.生理性的压力源
B.心理性的压力源
C.社会性的压力源
D.物理性的压力源
E.化学性的压力源