数字法是运用数据来表明事物的本质和特点,准确合理的数据使文章精确可信。
【例】
(1Nearly half of all Americans over age 20 wear a bridge or denture,and more than 20 percent have complete upper and lower denture. By age 50, one out of every two persons has gum disease.
(2And it seems sensible to wait. One quarter of all marriages between people under twenty-one end in divorce. In Britain in 1972, there were 124,248 divorces.
说明文的说明方法除上面介绍的常见的几种以外,还有诸如分项法、列举法、比喻法及引用法等,只有综合运用多种说明方法,才能多角度、多层次地全面、清晰、准确地展示客观事物的本来面貌。
设计题目(6)英文字母显示1
基本要求:
1.能用数码管自动一次显示出字母L、P、H、F、E、D、C、B、B、C、D、E、F、H、P、L;然后再从头循环,电路上电从L开始显示。
© 2022 xuexicn.net,All Rights Reserved.