金属的

Ta,Mo,W,Ti,Nb,the refractory impurity elements,in RE metals are dissolved thoroughly with the addition of fluoric acid,and then determined by ICP-MS.

在稀土金属的冶炼过程中，常用到一些由难熔金属制成的冶炼容器，这样极易引入相应的难熔金属杂质，如Ta、Mo、W、Ti、Nb等。

The effect of zeolites ion-exchanged by transition metals on thermal catalytic cracking reaction is studied. The product distributions of the cracking reactions catalyzed by theβor ZSM-5 zeolites exchanged with transition metals are different from that catalyzed by corresponding Hzeolites, which means the mechanism of cracking reactions has varied. Group Ⅷ metals Fe, Co, Ni and Cu, Zn are shown to be of strong catalytic activity of oxidative dehydrogenation, while Ti and Cr are not of oxidative activity. Catalyzed by zeolites or catalyst containing Ag, conversion of thermal catalytic cracking reactions and the yield of ethylene increase while the yield of propylene does not decrease. Silver can not only promote the formation of carbonium ion, but also convert carbonium ion into free-radical via redox reaction. The weak adsorption of olefins on silver reduces the occurrence of hydrogen transfer and dehydrogenation. As a result, the yield of light olefins is favored by silver in the catalyst.

采用过渡金属交换的分子筛作为催化剂，进行催化热裂解制取乙烯的反应，研究发现，在β沸石分子筛和ZSM-5分子筛中引入过渡金属后，催化热裂解反应的产物分布与相应的氢型分子筛相比有了较大的变化，说明过渡金属的加入对于催化热裂解反应的机理具有影响，Ⅷ族金属如Fe、Co、Ni和第Ⅰ、Ⅱ副族Cu、Zn表现出较强的氧化脱氢活性，产物中氢气、焦炭的产率很高，Ti、Cr则未表现出氧化作用：分子筛及催化剂中引入银后，催化热裂解反应的转化率和乙烯的产率有了提高，丙烯产率没有很大的变化，说明银在催化热裂解反应中能够促进正碳离子的生成，又有可能通过氧化-还原作用部分改变反应机理，促进了自由基的生成，并且由于银对烯烃的吸附很弱，其氢转移反应和脱氢、加氢活性比较低，有利于烯烃产率的提高。

Precious metals and their alloys and goods in precious metals or coated therewith, not included in other classes; jewelry, precious stones; horological and chronometric instruments.

不属别类的贵重金属及其合金，以及不属别类的贵重金属制品或镀有贵重金属的物品；珠宝，宝石；钟表和计时仪器。

Class 14 Precious metals and their alloys and goods in precious metals or coated therewith, not included in other classes; jewellery, precious stones; horological and chronometric instruments.

商标注册类别1 4 不属别类的贵重金属及其合金，以及不属别类的贵重金属制品或镀有贵重金属的物品；珠宝，宝石；钟表和计时仪器。

Precious metals and their alloys and goods in precious metals or coated therewith, not included in other classes; jewellery, precious stones; horological and chronometric instruments.

不属别类的贵重金属及其合金，以及不属别类的贵重金属制品或镀有贵重金属的物品；珠宝，宝石；钟表和计时仪器。

Class 14 Precious metals and their alloys and goods in precious metals or coated therewith, not included in other classes jewellery, precious stones horological and chronometric instruments.

类别14 不属别类的贵重金属及其合金，以及不属别类的贵重金属制品或镀有贵重金属的物品；珠宝，宝石；钟表和计时仪器。

Class 14 Precious metals and their alloys and goods in precious metals or coated therewith, not included inother classes; jewellery, precious stones; horological and chronometric instruments.

商标注册类别14 不属别类的贵重金属及其合金，以及不属别类的贵重金属制品或镀有贵重金属的物品；珠宝，宝石；钟表和计时仪器。

Class 14 Precious metals and their alloys and goods in precious metals or coated therewith, not included inother classes; jewellery, precious stones; horological and chronometric instruments.

不属别类的贵重金属及其合金，以及不属别类的贵重金属制品或镀有贵重金属的物品；珠宝，宝石；钟表和计时仪器。

Metals金属 Clean and degrease all metals coming into contact with NF3 using detergent or suitable cleaning agents that are free of finely divided metal chips and particles.

使用洗衣粉或没有金属粉末和颗粒的合适的清洗剂来为接触NF3的所有金属去污和去油。

X-ray is used to confirm the lattice ,and ultraviolet ray is used to measure the band gap. Measure electronic conductivity with digital panel meter and 4 Point Probe .

利用紫外光量测金属反蛋白石结构的光子能隙；扫描式电子显微镜观察镍金属堆积方式与型态；三用电表与四点探针测量其导电性；X光确定镍金属的晶格结构等等。

Fancy gold-plated dangling earrings with facetted White Opal crystals.

花式镀金悬垂耳环与facetted白欧泊水晶。

This essay chooses the study aim from biology teachers in middle school in Shi Jiazhuang which tells us that most of the middle school biology teachers in Shi Jiazhuang have the"burnout", lower successfulness, individualize.

本文选取石家庄市初中生物教师作为研究对象，运用问卷调查的方法对石家庄市初中生物教师职业倦怠的现状进行调查，调查结果发现，石家庄市初中生物教师这一群体普遍存在职业倦怠，情感枯竭程度偏高，成就感偏低，去个性化程度最为严重。