对于IT7级精度的工件，其最终工序应为______。
A．粗加工
B．半精加工
C．精加工
D．光整加工
参考答案：C
已知式子4xm-2是关于x的3次单项式，则m的值为______．
English _______ in many countries, but Chinese _______ their own language.
A．is spoken, speaks
B．speak, is spoken
C．is spoken, speak
D．is spoken, is spoken
