Consideration in Negotiable Instrument has specialty in existing time, including two situations: (1) the consideration relation should exist while Negotiable Instrument obtained.
票据对价在存在时间上有特殊性，包括两种情况：（1） 取得票据时存在对价关系即可；
2
Analyses of three existing types of instrument verification system.
分析了三种现有的仪表检定系统类型。
3
To the problems existing in the experiment of coefficient of viscosity with ND-2 instrument coefficient of viscosity, some improvements on the instrument are given.