A.5g/L B.10g/L C.15g/L D.100g/L
A.計(jì)算變異系數(shù) B.計(jì)算標(biāo)準(zhǔn)差 C.根據(jù)推定強(qiáng)度進(jìn)行合格判定 D.根據(jù)判定公式進(jìn)行合格判定
A.10~20 B.15~20 C.20~25 D.10~15