在104键盘中,辅助键区的功能键区各有多少个键()。
参考答案:30.12
A decision has been made _______ the new school building be built next month. [ ]
A. why
B. how
C. whether
D. that
简述炉渣的氧化性对转炉冶炼有哪些有利或不利的影响?