颌间结扎的患者用吸管进流食,流食主要经哪种途径自口腔前庭进入固有口腔()
A.牙间隙
B.间隙
C.舌下间隙
D.翼下颌皱襞与最后磨牙之间的间隙
E.A+B
参考答案:D
主动脉瓣关闭不全时可有以下周围血管征 ()
A.奇脉
B.交替脉
C.重搏脉
D.无脉
E.水冲脉
With a lot of children _________ noise around, the students couldn’t concentrate their attention on what they were learning.
A.to make
B.making
C.made
D.were making