男性患者,23岁,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()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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