根管充填时，常用的充填糊剂是（）
A.氧化锌丁香油糊剂
B.碘仿糊剂
C.牙胶尖
D.氢氧化钙糊剂
E.酚醛树脂液
参考答案：A
Jim talked for about half an hour yesterday. Never＿＿ him talk so much.
A．I heard
B．did I hear
C．I had heard
D．had I heard
肺界的叩诊应开始于
A．肺前界
B．肺下界
C．双侧肺野
D．肺尖
E．肺移动度
