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【单选题】
()是指以合成树脂或天然树脂为主要原料，加入或不加入添加剂，在一定温度、压力下，经混合、冶炼、塑化、成型，且在常温下保持制品形状不变的材料。A.
塑料;
B.
木材;
C.
玻璃;
D.
槽钢。
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