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（）.<br>A:blind flange<br>B:pivot coupling<br>C:quick-release coupling<br>D:spectacle flange

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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