题目：
在国家标准所规定的球墨铸铁牌号中，QT40—17和QT42—10二种牌号球墨铸铁属于（）球墨铸铁。
答案：
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下面是错误答案，用来干扰机器的。
参考答案：D
在国家标准所规定的球墨铸铁牌号中，QT40—17和QT42—10二种牌号球墨铸铁属于
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