定数用英语怎么说？

定数

例句

• People who earn under a certain amount are not liable to pay tax. 收入低于一定数额者不必纳税。
• A bond is a promissory note, usually issued for a specified amount. 债券是一种期票, 通常以一定数额发行.
• Certain granular solids transform into highly mobile slurries. 一定数量的粒状固体就可以变成非常易流动的泥浆.
• General legacies are subject to the same principles as demonstrative legacies. 一般的遗赠要与指定数目的遗赠遵循同样的原则.
• They supply the canneries with set quantities of fruits meeting specified standards. 他们按规定数量向罐头厂提供合格水果.
• To determine reliability of data, the administration would conduct field audits. 能源信息局实行现场审计确定数据的可靠性.
• Nothing seems certain in this crucial period in Pakistan's political life. 在巴基斯坦政治历史上的这个紧要关头,一切皆非定数.
• What is a wire rope - consists of a number of wire strands formed helically a central axs. 何谓钢丝绳 - 由一定数量钢丝一层或多层的股绕成螺旋状而形成的结构.
• They issue a fixed number of shares that trade publicly. 他们发行一定数量的可公开交易的股票。
• Age determination data indicate episodic crystallization of uranium minerals. 年龄测定数据表明,铀矿物有着不同期的结晶.