白塞病在中医称为（）
A.缠腰火丹
B.红蝴蝶
C.花柳病
D.狐惑病
E.花剥舌
参考答案：D
They asked many questions ___________ had nothing to do with that topic.
A．which
B．who
C．where
D．when
蜗杆的（）应在蜗轮轮齿的对称中心平面内。
A.中心线
B.轴心线
C.螺旋线
D.垂心线
