frequency n. 1.屡次,频仍,频繁。 2.(脉搏等的)次数,出现率;频度;【物理学】频率,周率。 audio frequency音频。 a high [low] frequency高[低]频。 the frequency of earthquakes in Japan 地震在日本的频繁发生。 mean [median] frequency中频。 resonance [resonant] frequency谐振频率,共振频率。 ultrahigh frequency超高频。 ultralow frequency超低频。 very high frequency甚高频。 very low frequency甚低频。
" with the internet - based delivery platform , both the number of test centres and the frequency of tests will increase significantly compared to five paper - based toefl tests offered annually , " said paul ramsey , senior vice - president of ets ' international development department 美国教育考试服务中心全球发展部高级副总裁保罗?拉姆西说: “过去的托福纸笔考是每年五次,新一代托福考试主要以网络传输为平台,其考点数量和考试频率将会大大增加。 ”
" with the internet - based delivery platform , both the number of test centres and the frequency of tests will increase significantly compared to five paper - based toefl tests offered annually , " said paul ramsey , senior vice - president of ets " international development department 美国教育考试服务中心全球发展部高级副总裁保罗拉姆西说: “过去的托福纸笔考是每年五次,新一代托福考试主要以网络传输为平台,其考点数量和考试频率将会大大增加。 ”
On the part of the design of nine - component thrust vector stand , an automatic hydraulic pressure original position calibration system , a scheme of original position calibration , and the great rigidity universal flexible combinatorial underprop are designed . by using the scheme of “ universal flexible combinatorial underprop plus software digital filter ” , the inherent frequency of test stand is improved , and the problem of test stand libration is solved . then , the resolving method of the disturbance between underprops of the moveable frame is proposed , and the disturbance revise equation is deduced 在推力矢量试车台设计方面,设计了自动液压原位校准系统、原位校准方案以及大刚度万向柔性组合支撑;采用“万向柔性组合支撑+软件数字滤波”的方案,提高了试车台动架的固有频率,解决了试车台动架的振动问题;提出了动架约束互扰问题的解决方法,推导了互扰修正方程;研究了九分力推力矢量测量误差分析方法,并计算了推力矢量测量精度。