We had a small _____ when I met him yesterday. [ ]
A. talk
B. speak
C. say
D. tell
答案:A
痹病的主要病机是()
A.经络痹阻,气血不通
B.经络痹阻,气血亏虚
C.经络痹阻,肝肾亏损
D.经络痹阻,痰瘀互结
E.经络痹阻,外邪侵袭
一圆与y轴相切,圆心在x-3y=0上,在y=x上截得的弦长为,求圆的方程。