单项选择题
A.100:5:1 B.10:5:1 C.100:20:1 D.100:10:1
A.酸 B.中 C.弱碱
A.150 B.135 C.110 D.125
A.>150℃ B.125~140℃ C.140~150℃ D.150~151℃
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