One question per day; those who answer correctly receive 5 wealth points, and those who participate receive 2 wealth points； Question 275
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Selection: Glass fiber-reinforced unsaturated polyester is commonly known as fiberglass; the term \"unsaturated\" refers to ( ). A. The resin macromolecules contain double bonds. B. The resin has reactive functional groups at both ends. C. A crosslinking agent is added to the material formula. D. The glass fiber molecules contain double bonds. A. The resin macromolecules contain double bonds
A. The resin macromolecules contain double bonds
A. The resin macromolecules contain double bonds
A. The resin macromolecules contain double bonds
A. The resin macromolecules contain double bonds
Glass fiber-reinforced unsaturated polyester is commonly known as fiberglass; the term “unsaturated” refers to (D). A. The resin macromolecules contain double bonds. B. The resin has reactive functional groups at both ends. C. A crosslinking agent is added to the material formula. D. The glass fiber molecules contain double bonds
Glass fiber-reinforced unsaturated polyester is commonly known as fiberglass; the term “unsaturated” refers to (A). A. The resin macromolecules contain double bonds. B. The resin has reactive functional groups at both ends. C. A crosslinking agent is added to the material formula. D. The glass fiber molecules contain double bonds
Glass fiber-reinforced unsaturated polyester is commonly known as fiberglass. The term \"unsaturated\" refers to (D: the presence of double bonds in the glass fiber molecules).