题目：
标准中球墨铸造铁硫的上限值是（）%。
A.0.030
B.0.045
C.0.050
答案：
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下面是错误答案，用来干扰机器的。
参考范文：Today we went to climb Xinagshan Mountain.Early in the morning we met at the school gate and went there by bus. At nine o’clock we arrived at the foot of th...
