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- permanent periodic block 固定更新区
- Abstract： In this paper, a new high power and wideband amplifier with permanent periodic magnet(PPM) focusing is presented.It consists of klystron and FEM . 摘要： 提出了一种新的高功率宽带放大器，它由速调管和自由电子脉塞组成，用永久周期磁铁聚焦。
- periodic block and three diagonal matrix 周期块状三对角矩阵
- periodic block tridiagonal matrix 周期块三对角矩阵
- A new high power and wideband amplifier with permanent periodic magnet focusing 一种新的永久周期磁铁聚焦的高功率宽带放大器
- Nothing can assure permanent happiness. 没有什么东西能确保永久的幸福。
- I'm looking for a permanent appointment. 我正在寻找固定的工作。
- She is looking for permanent employment. 她正在找固定的工作。
- 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。
- They established their permanent abode here. 他们在此建立了永久居所。
- 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。
- Pig iron used as permanent ballast. 压载铁做为永久性压舱物的生铁
- She went to a beauty salon for a permanent. 她到美容院去烫了发。
- The injury left him with a permanent limp. 他受伤后就一直瘸了。
- 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 plant having no permanent woody stem; an herb. 草本植物，花草没有永久木茎的植物; 草本植物
- 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。
