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
- Be he a civil engineer or an electrical engineer? 他是土木工程师还是电气工程师？
- The act of making null and void. 废除使 ... 作废和无效
- There are some electrical apparatus in the room. 房间里有些电器。
- There is a fault in the electrical system. 电路系统出了故障。
- The contract was null and void because it was not signed. 这个合同无效，因为它尚未签字。
- He is an electrical technician by profession. 他的职业是电工技师。
- The court ruled that the claim was null and void. 法庭裁决此项要求无效。
- All this electrical wiring will take a day to set up. 所有这些电线架线要花一天时间安装好。
- 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。
- electrical null 电零点
- A null reference pointer was passed to the stub. 向占位程序传送了空的索引指针。
- Now electrical appliances have entered into ordinary families. 现在家用电器已经步入普通家庭。
- The agreement was declared null and void. 这个协议被宣布无效。
- 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。
- Don't meddle with the electrical wiring: you're not an electrician. 别瞎动电线线路，你又不是电工。
- The operator O is the null operator. 算符O是零算符。
- Electrical conductivity affected by exposure to light. 光电导性，光电导率受光暴露影响的电传导
- 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。
