哪些X线投照部位需加用滤线器（）
A.手
B.足
C.头部
D.大腿
E.上臂
参考答案：C
晚期先天梅毒患者（）
A.传染性弱或无
B.心血管梅毒常见
C.有抵抗力
D.多在2岁以前发病
E.能查到病原体
---Would you like to watch Painted Skin Ⅱ with me?
---Certainly. I don't mind seeing again although I_______ it twice.
A．saw
B．was seeing
C．have seen
D．see
