【单选题】【消耗次数:1】
幼儿骨骼骨质中所含有的有机物与无机物的比例约()
2:1
3:1
1:1
1:2
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【单选题】 幼儿骨骼骨质中所含有的有机物与无机物的比例约为( )。
①  2:1
②  3:1
③  1:1
④  1:2
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①  正确
②  错误
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①  正确
②  错误
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