机电部门的代号为()。
A、Ⅰ
B、Ⅱ
C、Ⅲ
D、Ⅳ
参考答案:C
The team is good but not as good as ().
A.we
B.us
C.ours
D.ourselves
连铸坯偏析按钢的成份可分为正偏析和()