碱度（）为碱性渣，如E5015焊条的熔渣；碱度（）为酸性渣，如焊条E4303。
参考答案：大于1；小于1
The teacher spoke loudly in class so as to make herself ______clearly.
A．hear
B．to be heard
C．heard
D．, to hear
数模转换
