读量筒中液体体积时,某同学俯视读数为20 mL,则实际为 (    ) A

读量筒中液体体积时,某同学俯视读数为20 mL,则实际为 (    

A、大于20 mL   B、小于20  mL    C、为20 mL    D、无法判断

答案

B

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