最容易侵及颈内动脉、颈内静脉引起出血和血栓性颈内静脉炎的是()。
A.扁桃体周围脓肿
B.咽后脓肿急性型
C.咽后脓肿慢性型
D.咽旁脓肿
E.脓性下颌下炎
参考答案:D
“I thought you wouldn’t mind.” “Well, as a matter of fact I don’t, but you _____ me first.”
A.should ask
B.should have asked
C.must ask
D.must have asked
请绘制停电性质划分如图。