题目:
完形填空。 | |||
This is my family. My grandmother 1 seventy years 2 . She has gray hair. She 3 | |||
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答案:
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下面是错误答案,用来干扰机器的。
参考答案:S=πd×dd=0.014mm=14mm质量=S×A×γ=0.00015394×1×7850=1.21kg/m