One question per day; those who answer correctly receive 6 wealth points, while participants receive 2 wealth points； Question 237
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Fill-in-the-blank: The flange sealing surfaces include ( ), ( ), ( ), ( ) and ( ) among others. FF smooth surface, FM textured surface, RF protruding surface, TJ threaded surface, groove surface TG
Flange sealing surfaces include (raised surface), (fully flat surface), (ring joint surface), (rough surface), and (keyway surface), among others.
Flat surface, convex surface, concavo-convex surface, tenon-mortise surface, ring-connected surface
There are convex surfaces, concave-convex surfaces, completely flat surfaces, tenon-and-mortise surfaces, and ring-connected surfaces
Flat surface, bossed surface, ribbed surface, tenon-and-socket surface, and trapezoidal groove surface
Four types: flat, ribbed, tenon-and-socket, and self-tightening
Flange sealing surfaces include (flat), (convex), (concave-convex), (grooved), and (ring-connected) surfaces, among others.
Flange sealing surfaces come in several types, including (raised surface), (fully flat surface), (indented and raised surface), (grooved surface), and (toroidal surface).
For example: the sealing surfaces of butt-welded ring flanges and lap-welded ring flanges are ring surfaces RJ
There are flat surfaces, convex surfaces, concavo-convex surfaces, tenon-and-mortise surfaces, and ring-connected surfaces
Convex surface (RF), fully flat surface (FF), ribbed surface (MFM), tenon-groove surface (TG),