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划分粒组分界尺寸称为界限粒径。
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粗细颗粒搭配较好，粗颗粒间的孔隙有细粒填充，渗透性、压缩性较小，强度较大，所以我们在实际工程中选用级配较好的土为筑填材料。
重力式挡土墙适用于高度为10m的地段。
Listen to the passage and fill in the blanks with the words you hear. In the globalized society of the 21st century, we need to understand different cultures. Understanding different cultures helps us 1) ___________ unfamiliar environment in which we meet, work and live with other people from different cultures. Adjustment and 2) ___________toward different cultures help us to take active roles in the 3) ___________society. It is not only a matter of knowing what to say or when to arrive for a meeting, it also involves a continued effort to 4)___________our partners' culture and etiquette. We need to know and respect their greeting practice, gift-giving etiquette, table manners, and other aspects of etiquette. In a word, we need to be 5)___________to other cultures to be successful in this world.
Listen to the dialogues and choose the best answer for each question.Dialogue One
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