调查研究者卡莉娜•舒曼表和她的同事们进行两项研究试验，来观察两性是否在道歉的频率上存在差异，如果有，这些差异是因何而起。

Study researcher Karina Schumann and her colleagues conducted two studies to see if genders do indeed differ in how often they apologize, and if so, why this might be.

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试验研究了不同微弧氧化电压和脉冲频率对涂层微观形貌，涂层厚度及相组成的影响。

The effects of different oxidation voltage and pulsed frequency on microstructure, thickness and phase constitute of the coatings have been investigated.

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所进行的各种稳态和动态试验研究表明，该脉动流量信号发生器具有较高的脉动频率和明显的抗干扰能力等优点。

Some advantages of high pulsating frequency and good ability against interference of this flow signal generator are shown in the steady and dynamic experimental research on it.

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