英语翻译Concrete is a composite construction material composed primarily of aggregate,cement and water.There are many formulations that have varied properties.The aggregate is generally a coarse gravel or crushed rocks such as limestone,or granit
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/31 07:04:53
xV]S+j,j߶*.W9lmվl%5Ӓz=`MAd`l4 Y? pR[E{=/>HAm'Ͽ=K"0an>-BYB{B.s6RL
l9qƴ˽`mӝ_\re^-9FX`Q`Se(x@