the results of lead isotope analysis indicate that the materials of the bayan obo group originated at 1314 ma b. p. and that the mineralization occurred at 6650 ma b.p.

1、

as a comparison, a porcelain sample with underglaze blue in yuan dynasty was dated too, and its tl age is 620 ± 140 b.p..

为了便于比较，同时测定了一件元代青花瓷片，它的热释光年代为距今620±140a。

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2、

the formation of the estuary can be divided into fourstages: ( 1) last glaciation ( 2000-15000a b.p.)

据沉积作用和沉积相组合，钱塘江河口湾的形成及其发育可以分为四个阶段：（1）末次冰期（20000－15000aB，R）&下切河谷形成；

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3、

because of the fluctuation and change of the holocene climate the four sheet rainwash erosional-depositional phases happened approximately in 11500-11000a b.p.

由于全新世气候的波动变化，以及人类活动的影响，运城盆地洪积扇地表出现过4个比较明显的面状流水侵蚀-堆积作用阶段，时间分别在11500-11000aB.P。

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4、

after24ma b.p., with the stress field of the sinistral rotation and compressive shearing, formed the reverse structure in the northwestern basin.

之后在左旋压扭应力场作用下，形成了盆地西北部的反转构造；

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5、

the heavy fraction ( b.p.> 350 ℃) of the oil obtained during rotary kiln pyrolysis of used tires is mainly composed of aromatic hydrocarbons.

轮胎热解油的重质馏分（b.p.＞350℃），主要是由芳烃组成。

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6、

the moulins were formed in early quaternary, about 2~ 3 ma b.p., according to the study on climatic stratigraphy.

依据冰期气候地层法的分析、研究和对比，冰臼群大约形成于距今约2～3百万年的第四纪早期。

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7、

during the geological period of loess plateau, the relatively intensive stages of soil erosion included five stages: early period ( 2.5~ 2.4 ma b.p.)

黄土高原地质时期土壤侵蚀的相对强烈期为：更新世早期（2.5～2.4MaB.P.）

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; primary river terraces formed since the late pleistocene, and diluvium-alluvial plains formed at about 0.037 ma b.p..

晚更新世以来主要河流阶地形成，其间在0.037Ma前后冲洪积平原形成。

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9、

respectively, in sharp contrast with the main tectono thermal age ( 22.30 ± 1.8 ma b.p.) in their peripheral country rocks.

，与它周边的围岩经受的主要构造-热事件年龄（22.30±1.8Ma）截然不同。

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10、

research on the fluctuations of closed-lake level since 17000a. b.p. in the middle kunlun mountains

中昆仑山区距今一万七千年以来湖面波动研究

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11、

the second started in 10000a b.p. ( during the tianjin transgression).

第二次为10000aB.P.（天津海进期）。

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12、

the bose lithic industry of 0.80 ma b.p. in guangxi show us the features of acheulean-like technology.

距今80万年以手斧为特色的广西百色石器工业，展示了与西方阿舍利文化相似的技术面貌。

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13、

bergeron, b.p. "using the web to improve health care." advance for health information executives.1997.

利用网络改善健康照护〉，健康资讯行政的建议1997。

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14、

1850 ± 150ma b.p.& an important period of transition in the evolution of the earth

距今1850±150Ma&地球发展演化的重要转折时期

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15、

the period of age of copper and stone both used includes: hongshan culture ( 6500-5000 b.p.)

铜石并用时代考古学文化有红山文化（6500&5000B.P.）

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16、

yesterday i asked some questions through the hot line about buying, installing and using a digital b.p.

昨天我打热线询问了一些关于如何购买、安装、使用数字传呼机的问题。

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17、

in the early period of the holocene ( 11500-8500 a b.p.)

全新世早期（11500～8500aB.P.）

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a climatic decline took place during the late holocene from 3100 a b.p.

全新世晚期从3100aB.P。

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geomorphic transformational event around 1.2 ma b.p. in the southern shanxi province

山西南部1.2MaB.P.的地貌转型事件

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, late period ( 0.10~ 0.07 ma b.p.)

更新世晚期（0.10～0.07MaB.P.）

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