On thc basis of thc surface features of sand - lime bricks, rational mixturf ratios ofmasonry mortars for sand - lime bricks are studicd, rand cement mortars and composite cement- limemortars of different grades ranging from 2.5 to 15 MPa are prepared.是什么意思_On thc basis of thc surface features of sand - lime bricks, rational mixturf ratios ofmasonry mortars for sand - lime bricks are studicd, rand cement mortars and composite cement- limemortars of different grades ranging from 2.5 to 15 MPa are prepared.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句