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- The observation on 704 coal face of Fuliu coal mine shows that periodical pressure can also be caused by immediate roof due to its periodical rupturing under certain geological conditions. 本文依据广西罗城矿务局呼略矿704面的开采试验,说明了直接顶在一定的地质条件和生产技术条件下,也可以产生周期性的断裂,形成周期性的压力。
- Methods Using periodic pressure signals exciting and regressions.Results The dynamic characteristics of tubing system were also discussed. 方法采用周期激励方法的试验方法，并用多项式回归方法对试验结果进行回归处理，给出了传压管路的频率响应函数。
- 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。
- Reader's Digest is a periodical. 《读者文摘》是一种期刊。
- I expect regular periodical reports from you. 我期待你定期汇报。
- Childhood is a period of rapid growth. 幼年是生长迅速的时期。
- He consulted the chronicles of the period. 他参考了这一时期的编年史。
- A periodical published yearly; a yearbook. 年刊; 年鉴每年出版一次的期刊; 年刊
- 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。
- Periodic Pressure Osoillation At Tsing Hua Yuan,Peiping 大气压力之周期性波动
- 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？
- Chaucer wrote in the late mediaeval period. 乔叟写作的时代是中世纪末。
- She'll be away for an indefinite period. 她将离开一段时间，何时回来未定。
- This was the most difficult period of his life. 这是他一生中最艰难的时期。
- The meeting finally came to a period. 会议终于结束了。
