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- arithmetic period pulse 等差周期脉冲
- Because occu-pied space ratio of the periodic pulse signals diminishes, the detected minimum amplitude increases. 周期脉冲信号占空比变小，使检测到的最小脉冲幅度变大；
- The paper researches on the control of chaos or hyperchaos via the method of the tune-delayed feedback control(DFC), the proportional periodic pulse perturbation to the system variables (PP-SV) and limiting amplitude. 本文主要对时间延迟反馈法(DFC)、正比于系统变量的周期脉冲扰动法(PP-SV)及限幅法这三种控制混沌和超混沌系统的方法展开了研究工作。
- The little boy was not good at arithmetic. 这个小男孩算术不太好。
- She grounded her pupils well in arithmetic. 她给自己的学生打下良好的算术基础。
- That period was a bright page in the history of Chinese literature. 那个时期是中国文学史上光辉的一页。
- Let us hope that the period of this injustice will be over soon. 让我们希望这个不公正的时期很快结束吧。
- He got the answer by mental arithmetic. 他用心算得出了答案。
- He is good at mental arithmetic. 他擅长心算。
- I'm good at history but not so hot at arithmetic. 我的历史成绩不错，但算术不太好。
- Childhood is a period of rapid growth. 幼年是生长迅速的时期。
- He brushed up on fractions before taking the arithmetic test. 在参加算术考试前他又重温了分数。
- He consulted the chronicles of the period. 他参考了这一时期的编年史。
- He had to decide within a given period. 他得在一定时间内作出决定。
- She has a detailed knowledge of this period. 她对这段时期的情况了解地相当详细。
- In that period auto sales hit a14-year low. 这时期汽车销售量达到14年来最低水平。
- In this period, unemployment reaches record levels. 这段时间的失业人数又达到了创纪录水平。
- Which period of history are you studying? 你正在学哪一段历史？
- Can you tell me the time period when it was stolen? 能不能告诉我大概什么时候被偷的？
- What's the correct answer to this arithmetic question? 这道算术问题的正确答案是什么?
