these basic materials are selected for their properties, per

these basic materials are selected for their properties, per 英语翻译Properties of materials All materials have their own pro 英语翻译The important thermal properties to materials are:.Heat Commodities are basic materials that are used and traded wor these sweaters are made of （）materials none of these materials are conductors. These policemen are famous for 'always getting their man'.怎么 These are their balls. Are these their erasers? These are their -(book) These are their clothes.(对their提问） （)() are these These materials can be adapted for use with children.