您要查找的是不是：
- Design and Analyses of Orthogonale Test with Null Ratio Factor 零配比正交试验设计与结果分析
- The state or quality of being null. 无效无效的状况或性质
- The act of making null and void. 废除使 ... 作废和无效
- Keywords Sweet Potato （Ipomoea batatas （L.） Lam.）;Tissue Culture;Organ Genesis;Plant Regeneration;Orthogonale Experimentation;Null Ratio; 甘薯;组织培养;器官发生;植株再生;正交试验;零配比;
- The ratio of students to teachers is 35:1. 学生和老师的比率是三十五比一。
- The ratio of schoolboys to schoolgirls is 2 to 1. 男学生和女学生的比例是2比1。
- The contract was null and void because it was not signed. 这个合同无效，因为它尚未签字。
- The court ruled that the claim was null and void. 法庭裁决此项要求无效。
- Men outnumber women here in the ratio of three to one. 此地男子数量以三比一超过女子。
- The first or last term of a ratio or a series. 首项，末项比率或数列中第一个或最后一个项
- The marriage was declared null and void. 婚姻已宣告无效了。
- The null subset corresponds to the term 1. 空集则对应于常数项1。
- A null reference pointer was passed to the stub. 向占位程序传送了空的索引指针。
- The agreement was declared null and void. 这个协议被宣布无效。
- After-tax profit margin is the ratio of net income to net sales. 税後利润率指净收入与净销售之比。
- 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。
- The ratio of men to women was two to one. 男女的比例是二比一。
- The operator O is the null operator. 算符O是零算符。
- The interval between any two frequencies having a ratio of2 to1. 倍频程频率比率为2比1的两个频率的间隔
- A null field descriptor is the descriptor that forms the blank division in export. 一个空白字段描述符是在输出中形成空格的描述符。
