... 周期顶板压力 {采矿} periodic roof pressure; 周期动量 momentum of cyclic motion; 周期动作开关 periodically operated switch; ...
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周期性哮喘症状往往导致失眠、日间疲劳、减少活动量，不能上学和工作。
Recurrent asthma symptoms frequently cause sleeplessness, daytime fatigue, reduced activity levels and school and work absenteeism.
其中长周期运动控制律设计时，结合了喷气推力控制来辅助偏置动量控制；
When design the control method of long-time cycle movement, whiff thruster is used to assistant the control system.
频率微扰商是表示连续元音发声时声带振动相邻周期间的微细变动量； 发声效率反映平均气流率与声能的有效转换率。
PP indicates the amount of irregular vibration of vocal folds and I/F represents efficient transition from MFR to acoustic energy.
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