WES征
参考答案：
充满型胆囊结石，胆囊内液性暗区消失，呈弧状强回声光带伴宽的直线声影，即WES征。其中W为近场的胆囊壁，E为结石强回声，S为后方声影。
_______ the task on time, he was fired by the boss.
A．Not completed
B．Not having completed
C．Not have completed
D．Not being completed
喉腔最狭窄的部位是（）
A.喉前庭
B.喉室
C.声门裂
D.前庭裂
E.声门下腔
