Methods: the first derivation spectrophotometry method was used to determine the content and content uniformity of methylphenidate hydrochloride tablets with the solvent of water.
方法：以水为溶媒用一阶导数光谱法测定盐酸哌甲酯片的含量及含量均匀度。
State equations the derivation of state space models is no different from that of transfer function in that the differential equations describing the system dynamics are written first.
状态空间模型的推导与传递函数的推导没有什么不同，总是先将描述系统特性微分方程写出来。
The derivation of state space models is no different from that of transfer function in that the differential equations describing the system dynamics are written first.
状态空间模型的推导与传递函数的推导没有什么不同，总是先将描述系统特性微分方程写出来。
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