百万分之二十的英文表达是
百万分之二十的英文表达是
A.20 part per millions
B.20 parts per million
C.20 part per million
D.20 parts per millions
正确答案:20 parts per million
百万分之二十的英文表达是
A.20 part per millions
B.20 parts per million
C.20 part per million
D.20 parts per millions
正确答案:20 parts per million
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