制造周期较长的备品配件应根据实际情况提前申报需求计划。进口备品配件一般要提前()月申报需求计划。
A.三个
B.六个
C.六至十二个
D.十二个
参考答案:C
The movie is so _______ that I am very _________ in it.
A. interesting, interesting B. interested, interested C. interesting, interested
简述普通碳素钢与优质碳素钢的区别。