土的()对土方酌平衡调配、基坑开挖时的预留土量及运输工具数量的计算均有直接影响。
A.密度
B.可松性
C.孔隙率
D.含水量
参考答案:B
_____the beginning of the 19th century did scientists know that all matter is made up of atoms.
A,At B,By C,Up to D,Not until
严禁未登记要点用手摇把转换道岔。