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【单选题】
根据离心式压气机工作原理可知,气体流经压气机时的状态参数变化情况是_____。1空气进入叶轮后至排气蜗壳出口,压力一直上升2空气进入叶轮后至排气蜗壳出口,压力上升、下降、上升3空气进入叶轮后至排气蜗壳出口,温度一直上升4空气进入叶轮后至排气蜗壳出口,温度下降、上升、下降5空气进入叶轮后至排气蜗壳出口,速度上升、下降、下降6空气进入叶轮后至排气蜗壳出口,速度上升、下降、上升A.
①②③
B.
②④⑤
C.
②③④
D.
①③⑤
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