您要查找的是不是：
- The state or quality of being null. 无效无效的状况或性质
- null valence 零价
- The act of making null and void. 废除使 ... 作废和无效
- The contract was null and void because it was not signed. 这个合同无效，因为它尚未签字。
- A closely related concept is that of free valence. 一个密切有关的概念是自由价。
- The court ruled that the claim was null and void. 法庭裁决此项要求无效。
- The outer ring contains the valence electrons. 排在外层的有价电子。
- The marriage was declared null and void. 婚姻已宣告无效了。
- An atom or a radical with a valence of 1. 一价原子或一价基。
- The null subset corresponds to the term 1. 空集则对应于常数项1。
- Having a valence of four;tetravalent. 四价的；四个原子价的
- A null reference pointer was passed to the stub. 向占位程序传送了空的索引指针。
- Elements 3 is a nonmetal with one valence electron. 元素3是带-1价的非金属元素。
- The agreement was declared null and void. 这个协议被宣布无效。
- Input your touch valence to coil number. 输入你的抵价卷号码。
- Having a valence of four; tetravalent. 四价的；四个原子价的
- Having a valence of1; univalent. 有一价的；单价的
- A promise obtained by force is legally null. 一个以武力获得的契约在法律上是无效的。
- An atom or a radical with a valence of1. 一价原子或一价基
- The operator O is the null operator. 算符O是零算符。
