肺动脉高压早期的x线表现是
A．双肺纹理增多
B．双肺透亮度增加
C．右下肺动脉主干增宽
D．右心房肥大
E．右心室肥厚、扩张
参考答案：C
— How was your trip?
— ______. I hope I can go there again. [ ]
A. Just so so
B. Not very good
C. Nothing special
D. Wonderful
烧结点火的目的和要求是什么？
