单选题A single fitting installed in a pipeline that either blanks off the pipe or allows a full flow passage of a liquid through the pipe is referred to as a（）.Ablind flangeBpivot couplingCquick-release couplingDspectacle flange
单选题
A single fitting installed in a pipeline that either blanks off the pipe or allows a full flow passage of a liquid through the pipe is referred to as a（）.
A
blind flange
B
pivot coupling
C
quick-release coupling
D
spectacle flange
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