![](https://static.youtibao.com/asksite/comm/h5/images/m_q_title.png)
[单选题]
下列不属于K421出口循环丙烯的是()
A.M420机械密封冲洗丙烯FIC4212
B.反应器穹顶喷淋丙烯FIC4226
C.D422底部喷射器推进剂丙烯FIC4214
![](https://static.youtibao.com/asksite/comm/h5/images/m_q_a.png)
A、M420机械密封冲洗丙烯FIC4212
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.M420机械密封冲洗丙烯FIC4212
B.反应器穹顶喷淋丙烯FIC4226
C.D422底部喷射器推进剂丙烯FIC4214
A、M420机械密封冲洗丙烯FIC4212
A.系统轻组分多
B.出口丙烯冷凝器液面低
C.二元冷剂收集罐的液面低
D.系统负荷过大