在2Mg+O22MgO的反应中,各反应物、生成物之间的质量比是[ ]
A.3:4:5
B.3:2:5
C.3:2:10
D.3:4:10
答案:B
Can you people on the phone by the sound of their voice? [ ]
A. make up
B. make over
C. make out
D. make of
经济批量法