2 if you are using the word number as a regular noun, it. The abbreviation no. is used only in front of an actual number, e.g., no.5 paragraph no.7 husband no. In such cases it means if your answer is no.
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都可以。 number 做「第几、几号」时，可以缩写为 no.、no.、#。其中，全小写的 no.
I'm not sure whether this is the only context in. Serial number （s.n.） 一般用于对某个位置或某个设备进行标识，由一串字母或数字组成。很多 sdk 或 数码产品 都会有标识码，笔记本一般都在底面上。 比较强调唯一性，侧重于产品的唯. If no can be used for yes/no questions on forms and in questionnaires, yes.
