门静脉海绵样变
A.腹部压疼最显著的部位B.板状腹C.右下腹柔软无压疼D.腹胀肠鸣音消失E.腹式呼吸消失
参考答案:D
已知方程x2+y2-4x+2my+2m2-2m+1=0表示圆C.
(Ⅰ)求实数m的取值范围;
(Ⅱ)在已知方程表示的所有圆中,能否找到圆C1,使得圆C1经过点P(2,1),Q(4,-1)两点,且与圆x2+y2-4x-5=0相切?说出理由.
Are we going to all night, or shall we go out?
A.sit by
B.sit up
C.sit around
D.sit down