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【单选题】
下列哪些物质是高分子合成材料?( ) I塑料 II 合成橡胶 III 合成纤维 IV 乙苯A.
I
B.
I+II
C.
I+II+III
D.
I+II+III+IV
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A.
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B.
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C.
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D.
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