單項選擇題CRH2A 給水衛(wèi)生系統(tǒng)DTC 顯示故障代碼16,真空壓力開關判斷故障:真空發(fā)生器抽真空時間是()

A.7S-15S
B.8S-16S
C.9S-17S
D.10S-18S


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