【单选题】【消耗次数：1】
右心房、室增大，肺脉动脉段凸出，两肺门大而搏动增强，右下肺动脉干增粗达17mm，两肺纹理增多增粗，边界清晰，肺野透过度正常，其肺循环变化是
①
肺血减少
②
肺充血
③
肺淤血
④
肺出血
⑤
肺栓塞
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