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This dissertation analyzes the gamma ray detection methods presented in literatures and point out the limitation of popular methods, and then make discussion about the novel detection theory and technique for PET.

本文在分析了大量文献的基础上，对位置灵敏型γ射线探测器进行了深入的研究，提出了适合PET成像的新探测理论与技术，取得了一定的成果。

However, the concentration profiles of p-nitrophenol and p-nitroaniline in alkaline solutions changed very little because of the limitation of mass transport of gaseous ozone into the liquid phase.

然而，在碱性溶液中，有机物的降解速率随pH值增加很少，这是因为受到从气相向液相扩散的臭氧量的限制。

Due to time limitation, you will not be able to use your own gel for size analysis.

由於时间有限，你将无法使用自己的胶体进行大小的分析。

Limitation in ascension has to do with one's genealogical inheritance.

提升的限制与你基因宗谱的遗传有关。

In electric system, conventionally it is adopted that a generatrix is connected with a transformer in low pressure system due to limitation of the capacity of switch and operation mode.

在电力系统中，由于开关容量及运行方式限制，通常在低压系统中多采用 1段母线、1台变压器运行方式。

Daoism culture is an important part of Chinese traditional culture, which covers many aspects, has a long history and contains rich ecological thoughts, including integrity concept of object and me, balance concept of knowing laws and harmony, exploitation principle of knowing limitation and satisfaction, equality concept without gentle and simple and so on.

道家文化是中国传统文化的重要组成部分，它博大精深，源远流长，蕴涵着丰富的生态思想，包括物我一体的整体观念、知常知和的平衡观念、知止知足的开发原则、物无贵贱的平等观念等。

Although Gentleman's Agreement has placed some limitation on providing favorable terms and conditions by ECAs to prevent distortion of fair competition and has effect to a certain degree.

尽管"君子协议"等都对限制各国提供破坏公平竞争的优惠条件起到了一定的作用。

The limitation of the geometric optics and Airy theory is discussed.

讨论了几何光学和艾里理论局限性，将米氏理论和几何光学结合，对彩虹现象给予了更为合理的解释。

It gives the limitation of geometrical optics.

它给出了几何光学的限度。

RESULTS It's significant level of the differences of Stilpnotia candida, geometrid, leaves' number between no-light area and light-district area. Jiaduo multi-frequency vibration-killing lamps has a obvious effect to control pests in the tea garden, especially for Stilpnotia candida, geometrid and leaf which has a more prominent role in the booby traps, the difference between lights district with no-lights district is up to a very significant level, But it's limitation to control leafhopper.

有灯区和无灯区中毒蛾、尺蠖、叶甲的数量差异达到了极显著水平；频振式杀虫灯对茶园害虫的防治效果明显，特别是对毒蛾、尺蠖和叶甲类的诱杀作用较突出，对它们的防效有灯区与无灯区间差异达到了极显著水平，但是对叶蝉的防治还是有一定的局限。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。