题目

英语翻译
A secound class of SI units comprises the deriver units,many of which have special name.Table1-4 is a list of those we shall find most useful in our work in this book.
The radian(symbol rad) is a supplemental unit in SI for a plane angle.
A series of names and symbols to form multiples and submultiples of SI units has been established to provide an alternative to the writing of powers of 10.Table A-1 includes these prefixes and symbols.

提问时间：2020-12-02

答案

一个SI单位第二类包括驱动单元,其中有许多特殊的名字.table1-4是一个名单,我们将在本书中找到最有用的.
弧度（符号RAD）在Si补充单元的平面角.
一系列的名称和符号组成的倍数和分数单位的Si已建立的10的幂的写作提供了一种替代的.表A-1包括这些前缀符号.