One question per day; those who answer correctly receive 6 wealth points, while participants receive 2 wealth points； Question 258
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Fill-in-the-blank: Non-metallic lined pipes include ( ), ( ), plastic-coated steel pipes, etc. Answer: Rubber-lined pipes, steel-plastic composite pipes
(Electroplated glass tubes, steel-lined rubber tubes), plastic-coated steel pipes.
Non-metallic lined pipes include (rubber-lined pipes), (glass-lined pipes), and plastic-coated steel pipes, etc. Plastic-lined pipe,
Non-metallic lined pipes include (PE), (EP), and plastic-coated steel pipes, etc.
Non-metallic lined pipes include (rubber-lined pipes), (steel-plastic composite pipes), and plastic-coated steel pipes, etc.
PTFE and PVC, I guess
Fill-in-the-blank: Non-metallic lined pipes include ( ), ( ), plastic-coated steel pipes, etc. Rubber-lined pipes, steel-plastic composite pipes
Steel-lined rubber pipes, steel-lined glass pipes, glass-lined pipes, plastic-lined pipes, pipes coated with rigid polyurethane foam
Steel-lined rubber pipes, steel-lined glass pipes
Asphalt-lined anti-corrosion steel pipes, cement mortar-lined anti-corrosion steel pipes