供网页使用的图形的导出过程分为几步？（）
A、1步
B、2步
C、3步
D、不确定
参考答案：B
_ people went to the concert which was held in People's Square _ the night of May Day. [ ]
A. Thousands of; in
B. Thousand; on
C. Many thousand; in
D. Thousands of；on
物料编码的增补工作，要严格按照什么流程进行？
