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【单选题】
干燥失重测定法中,取供试品,在规定条件下干燥至恒重,所谓恒重是指。( )
A.
连续两次干燥后的重量差异在0.3mg以下
B.
第二次干燥后的重量比前一次的少0.4mg以下
C.
干燥后的重量差异在0.5mg以下
D.
干燥前后的重量差异在0.3mg以下
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