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毎日1問、正解者には6つの財富を、参加者には2つの財富をプレゼント;第457題

2016-03-08View Original

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単一選択問題:工場の作業エリアにおける塩化ビニルの許容濃度は30mg/m3であり、これは体積濃度にして( )ppmに相当する。 A 15.3 B 24.1 C 11.7 正解:C 11.7
Reply #22016-03-08
C11.7~~~~~~~~~~~~~~~~~~
Reply #32016-03-09
作業場の空気中における塩化ビニルの許容濃度は30mg/m3で、これは体積濃度に換算すると(C)ppmに相当する。 A 15.3 B 24.1 C11.7

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