We cook ___________ the stove. [ ]
A. on
B. in
C. near
答案：A
风湿性心脏病二尖瓣狭窄伴肺动脉高压者可听到( )
A．心包叩击音B．二尖瓣开瓣音C．Austin-Flint杂音D．喀喇音E．Cmham-steell杂音
含油边界和含油面积
