kathy sham2020-10-19 19:35:50
Why do I measure the D2 negative 0.860 instead of positive number??? Can u so the step with numbers accordingly?
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Cindy2020-10-22 16:51:32
同学你好,如果你算出来是一个负值的话,可以把计算过程拍给老师看看吗,这样老师才能帮你纠错呀……
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