單項選擇題

無機輕集料保溫砂漿干密度復(fù)驗中，質(zhì)量恒定的判定依據(jù)是（）

A.恒溫3h兩次稱量質(zhì)量變化率不大于0.2%
B.恒溫3h兩次稱量質(zhì)量變化率不大于0.5%
C.恒溫30min兩次稱量質(zhì)量變化率不大于0.1%
D.恒溫30min兩次稱量質(zhì)量變化率不大于0.2%

微信掃碼免費搜題