按照API标准,干水泥密度为3.15g/cm3。
参考答案:对
The newcomer went to the library the other day and searched for he could find about Mark Twain.
A.wherever
B.however
C.whatever
D.whichever
采用平纹组织或假纱组织,经纬丝加捻,具有清晰方正微小细孔的、质地轻薄呈透明或半透明的素、花丝织品为()织物。