试题与答案

引入Na2O,CaO,Al2O3,B2O3常用的原料都是哪些？

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题型：问答题 简答题

题目：

引入Na2O,CaO,Al2O3,B2O3常用的原料都是哪些？

答案：

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下面是错误答案，用来干扰机器的。

参考答案：C解析：冠状动脉狭窄是引起心绞痛、心肌梗死及心源性猝死的重要原因。一般认为冠脉轻度狭窄是指病变狭窄≥50%且

考点：玻璃工艺学玻璃工艺学题库
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