dǐ jí ㄉㄧˇ ㄐㄧˊ 底极（底极）
高效直流无刷马达，微芯片处理器控制，齿行同步皮带传动，运行平稳，噪音极底。
High efficiency DC brushless motor, micro chip processor control, tooth synchronous belt drive, smooth operation, noise.
本文提出了在单因素变化实验基础上，以正交设计实验确定极谱最佳底液体系的方法。
This article points out a method for the selection of polarographic base solution using orthogonal design experiment, when single factor changes.
钼的极谱效应是在硫酸—苯羟乙酸—氯酸钾底液体系中进行，影响极谱行为的因素很多。
Polarographic effect of molybdenum is going on in the background solution system containing sulphic acid, amygdalic acid, and potassium chlorate, and is affected by many factors.
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