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【简答题】
砂的粗细用（）表示，颗粒级配用（）或（）来判定。骨料级配良好的标准为：空隙率（），总表面积（）。
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举一反三
【简答题】The bed has been ________ in the family. It was my great-grandmother’s originally. A) handed out B) handed over C) handed down D) handed round
【单选题】The bed has been _________ in the family, it was my great-grandmother's originally.
A.
handed our
B.
handed over
C.
handed down
D.
handed round
【单选题】According to the passage, it has been suggested that the science of human relations was slow to develop because______.
A.
early scientists were more interested in the physical world
B.
scientific studies of human relations appear to investigate the obvious
C.
the scientific method is difficult to apply to the study of human relations
D.
people generally seem to be more attracted to literary than to scientific writings about human relations
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