is metal a conductor, yes, no, sometimes , Does plastic come from Nature, No, yes, sometimes, Is glass transparent, no , sometimes, yes, is wood a insulator, no, sometimes, yes, Is freezing a reversible change, yes, no, sometimes, is Plastic waterproof , yes, no, sometimes, What is sieving , A mixture made from solid particles, Separating a mixture of sand and water.

Learning

由
列印
嵌入

排行榜

視覺風格

選項

切換範本

)
恢復自動保存: ?