公称最大粒径
参考答案:
是指集料可能全部通过或者有少量不通过(一般容许筛余量小于10%)的最小标准筛筛孔尺寸。
Value systems,world views,national traits,aesthetic standards and thinking patterns are often regarded as the central part of ______.
行车调度员的基本职责是什么?