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Radium does not occur free in nature but occurs in natural ores such as pitchblende as a disintegration product of radioactive decay of heavier elements, including uranium.

在自然界镭不存在游离状态，但存在于天然矿石中，如沥青铀矿，是更重元素放射性衰变的产物。

Radium does not occur free in nature but occurs in natural ore s such as pitchblende as a disintegration product of radioactive decay of heavier elements, including uranium.

在自然界镭不存在游离状态，但存在于天然矿石中，如沥青铀矿，是更重元素放射性衰变的产物。

Based on the analysis of parent-daughter relationships in the three relevant fission product decay chains, a two-step delayed chemical separation procedure for rapid isolation of 91Sr from neutron-irradiated 235U sample was developed.

以衰变链中的母子体关系为依据，"两步延迟分离法"为基础，对裂变产物中91Sr的快速分离方法进行了研究。

Fu Cheng shows 360 safe bodyguard controller, on March 6 this special day enables 360.cn domain name, the mark is worn 360 websites were finished from a safe product the decay to a safe platform, did not come to 360 safe centers to will include a series of software such as firewall of 100 divisions of 360 safe bodyguard, 360 software, 360 safe, 360ARP and service.

360安全卫士负责人傅盛表示，在3月6日这个非凡的日子启用360.cn域名，标志着360网站完成了从一款安全产品向一个安全平台的蜕变，未来360安全中心将会包括360安全卫士、360软件百科、360保险箱、360ARP防火墙等一系列软件和服务。

Chief Fu Cheng expresses, on March 6 this special day enables 360.cn domain name, the mark is worn 360 websites were finished from a safe product the decay to a safe platform, did not come to 360 safe centers to will carry below the banner 360 safe bodyguard, 360 software a series of software such as firewall of 100 divisions, 360 safe, 360ARP and service, offer safe solution for broad netizen.

负责人傅盛表示，在3月6日这个非凡的日子启用360.cn域名，标志着360网站完成了从一款安全产品向一个安全平台的蜕变，未来360安全中心将携旗下360安全卫士、360软件百科、360保险箱、360ARP防火墙等一系列软件和服务，为广大网民提供安全解决方案。

The volume of radon chamber is 4 m3, the range of radon concentration is 370~20 000 Bq/m3, and the relative expanded uncertainty of measurement results is no more than 5.8%. The whole testing system can verify/calibrate the radon monitor and study on the radioactive aerosol of radon decay product.

装置氡室体积为4 m3，氡浓度测量范围为370~20 000 Bq/m3，氡浓度值测量结果的相对扩展不确定度不超过5.8%，可用于测氡仪器的检定校准和氡子体放射性气溶胶的实验研究。

Finishing from a safe product the decay to a safe platform, did not come to 360 safe centers to will carry below the banner 360 safe bodyguard, 360 software a series of software such as firewall of 100 divisions, 360 safe, 360ARP and service, offer safe solution for broad netizen.

而与3.6亿巨额投入形成对比的是，新公司所运营的互联网安全平台将继续推行免费使用策略。

Alloy membrane is used to separating hydrogen isotope,but after operating tritium,decay product 3He resorts in alloy membrane,forms helium bubble s and affects the macroscopical properties of alloy membrane.

PdY8.5Ru0.19合金是用于氢同位素分离的膜材料，但涉氚操作后，衰变3He会滞留在合金膜中并形成氦泡，影响其宏观性能。

We consider the following system: A manufacturer transports the fresh products to a distant whole; ale market Because of the uncertain transportation delays, he faces the risk that the Product may decay or deteriorate before it arrives at the distant market.

其中生产商从生产基地将时鲜产品运输到远方批发市场进行销售；因为远距离运输的不确定性，他需要承担时鲜产品中途变质的风险。

In the world, become world the biggest fruit to produce a country, but long-term since because take crop seriously, negligence quality, take measure of the increase production before collecting seriously, negligence collects an aftertreatment, store up treatment, the decay after causing fruit greens product to collect is degenerative and serious, loss is great, main show is in these problems the following respects: 1Structure of breed of product of.1 fruit greens is unreasonable although the crop of fruit greens product of our country is tall, but quality is poorer, market price is low, breed structure is unreasonable, early, medium scale of ripe, late-mature breed is undeserved, do not have especially comfortable the high grade breed at treatment, restricted our country fruit to machine the development of course of study apparently.

因此提高果蔬产品的质量，发展贮藏加工业，是我国果蔬产业发展亟待解决的问题。1 目前我国果蔬产业发展中存在的问题自 1993年以来，我国果品产量跃居世界第 1位，成为世界第一大水果生产国，但是长期以来由于重视产量，忽视质量，重视采前增产措施，忽视采后处理、贮藏加工，造成果蔬产品采后腐烂变质严重，损耗极大，这些问题主要表现在以下几个方面：1.1 果蔬产品品种结构不合理我国的果蔬产品产量虽高，但质量较差，市场售价低，品种结构不合理，早熟、中熟、晚熟品种比例不当，非凡是没有适于加工的优质品种，明显制约了我国果品加工业的发展。

But GST= 0.156, Nm=1. 588. As a result, the foundation of Youyongchi Avicennia marina population was the result of the migration of hypocotyles and human factors.

这项工作可以为海岸防护林中新引进种类的判定以及为研究种群建立者效应方法的确定提供科学依据。

The two-dimensional CDRC-ADI-FDTD update equations for collision unmagnetized plasma are induced. The unconditional stability of the CDRC-ADI-FDTD formulation for collision unmagnetized plasma is obtained by the examples.

推导了碰撞非磁化等离子体中的二维CDRC-ADI-FDTD迭代公式，并用算例验证了碰撞非磁化等离子体CDRC-ADI-FDTD算法也是无条件稳定的。