药厂使用电动研磨器将一批晒干的中药磨成药粉。厂长决定从上午10点开始，增加若干台手工研磨器进行辅助作业。他估算如果增加2台，可在晚上8点完成，如果增加8台，可在下午6点完成。问如果希望在下午3点完成，需要增加多少台手工研磨器?

A.20 

B.24 

C.26 

D.32

Multipurpose Internet Mail Extension (MIME) is a (71) document messaging standard in the Internet enviroment, with MIME, users can send (72) Email messages that include audio, video, graphices, and text to any other user of a TCP/IP network. Richtext information can also be (73) into messages. It defines the fonts, formats, and (74) features of a document so the document can be easily (75) on many different types of systems.

A．analog

B．many

C．multimedia

D．digital