减压阀安装时,在阀的进、出口处一般要伴装()阀。
A.安全
B.止回
C.截止
D.疏水
参考答案:C
解析:
减压阀,用于管路中降低介质压力,其进、出口处一般要伴装截止阀。
He hurried to the railway station, _____ buying a ticket for her daughter. [ ]
A. with the purpose of
B. on purpose of
C. by purpose of
D. at the purpose of
“法人管项目”六集中管控指那“六集中”?