material should vary according to its type,sharp,etc.for example,bitumen,which comes in a variety of forms,is combined with other raw materials in the construction of pavement,waterproofing compounds,and many oters.4696
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material should vary according to its type,sharp,etc.for example,bitumen,which comes in a variety of forms,is combined with other raw materials in the construction of pavement,waterproofing compounds,and many oters.4696
material should vary according to its type,sharp,etc.for example,bitumen,which comes in a variety of forms,is combined with other raw materials in the construction of pavement,waterproofing compounds,and many oters.4696
material should vary according to its type,sharp,etc.for example,bitumen,which comes in a variety of forms,is combined with other raw materials in the construction of pavement,waterproofing compounds,and many oters.4696
材料的类型,尖锐程度等应当多种多样,比如,呈现多种形态的沥青,就与在人行道的建造,防水合成物以及其他许多方面所使用的原材料相结合起来.