• 2021-04-14
    p.p1%20%7Bmargin%3A%200.0px%200.0px%200.0px%200.0px%3B%20font%3A%2036.0px%20SimSun%3B%20color%3A%20%23ffffff%7D%0Aspan.s1%20%7Bfont-kerning%3A%20none%3B%20font-variant-ligatures%3A%20no-common-ligatures%7D%0Aspan.s2%20%7Bfont-kerning%3A%20none%3B%20font-variant-ligatures%3A%20no-common-ligatures%3B%20color%3A%20%23ffff66%7D
    细集料应选用、质地坚固、吸水率、
    空隙率的洁净天然中粗河砂、也可选用专门机
    组生产的人工砂,不得使用