铬

Thus, Chinese current standards include 12 heavy metals and harmful substances in apple, such as lead, cadmium, hydrargyrum, abio-arsenic, chrome, arsenic, selenium, copper, fluorine, rare earth, nitrite, nitrate, and also the residue limit of 56 pesticides.

至此，我国现行标准中，共包含了苹果中铅、镉、汞、无机砷、铬、砷、硒、铜、氟、稀土、亚硝酸盐、硝酸盐等12种重金属和有害物质以及56种农药的残留限量。

If operate as per production regulation,qualified non-polluted agricultural products can be produced.4 The detection rate of r-BHC in the grain is 24.0%,which is within the range of standard,other BHC isomers are not detected;No BHC in vegetables;No DDT in grain and vegetables;The total detection rate of 4 types of organic phosphor pesticides is 31% in the grain and vegetables,within which the content of dichlo rovinyldimethy 1 phosphate and dimethoate is a little bit higher than the standard,but the content of Baytex and Sunithion is lower than the staneard.5 The heavy metal detection rate in the grain and vegetables are stated respectively as following:Arsenic:none,none; Chrome:8%,72.4%; Lead:6%,13%;Cadmium:none,none; Hydrargyrum :none,none.

粮食中γ一六六六的检出率为24.0％，未出现超标现象，其他六六六异构体均未测出，蔬菜中六六六未检出，粮食和蔬菜的DDT未检出；粮食和蔬菜中的四种有机磷农药总检出率为31％，其中敌敌畏、乐果出现个别超标现象，倍硫磷和杀螟松未出现超标现象。 5、重金属在粮食和蔬菜中的检出率分别是：砷：未检出、未检出，铬：8％、72.4％铅字6％、13％，镉：未检出、未检出，汞：未检出、未检出。

Reaction mechanism for 11,1,2-tetrafluoroethane preparation is carried out through gas phase fluorination by hydrogen fluoride over chromium-magnesium fluorination catalysts with trichloroethylene as main materials and dynamics models are set up.

研究了以三氯乙烯为主要原料，在铬镁氟化催化剂存在下，用氟化氢气相氟化制备1，1，1，2-四氟乙烷的反应机理，建立了动力学模型。

It can clear away alien color and foreign substance from the water and can remove heavy metal such as merury.lead,cadmium.zinc,iron,manganese and chromium.and hydrogenate,sulphide remaining chloride and so on .

能去除清水中异色、异味和铅、镉、锌、锰铬等重金属物质。

It can clear away alien colour and foreign substmce fron the water and can remove heavy metalsuch as mercury,lead,cadmium,Zink,iron,manganese and chromium,and hydrogenate,sulphide,samallamount of remaining chlorideang so on .

能去除清水中异色、异味和汞，铅、锌、铁、锰，铬等金属物质。

The processes for preparing collagen and collagen hydrolyzate from chrome shavings have been summarized in the present paper.

本文对从铬鞣革屑中提取胶原及其降解产物的方法进行了综述。

Results toxic test and ld 50 test showed that nata de coco strain was free from toxin.quality control system has not been established and sanitary facilities were incomplete in most fac-tories.totally54samples of nata de coco were hygienically determined.the pollution level of elements of pb,as,nitrate and nitrite was low,but chromium was relatively higher.no aflatoxin b 1 and pathogenic bacteria were detected.the residual hydrogen peroxide were detected from15out of the18samples detected.

结果 菌种毒力试验和急性毒性试验（ld 50 ）显示为无毒物；多数企业未建立卫生管理制度，卫生设施不完善；采集54份椰果样品做卫生学检测，铅、砷等重金属元素、硝酸盐、亚硝酸盐污染水平较低，铬含量相对较高，未发现黄曲霉毒素b 1 和致病菌的污染；18份椰果样品中有15份残留过氧化氢。

Results Toxic test and LD50 test showed that Nata de coco strain was free from toxin. Quality control system has not been established and sanitary facilities were incomplete in most factories. Totally 54 samples of Nata de coco were hygienically deten＇nined.

结果菌种毒力试验和急性毒性试验（LD50）显示为无毒物；多数企业未建立卫生管理制度，卫生设施不完善；采集54份椰果样品做卫生学检测，铅、砷等重金属元素、硝酸盐、亚硝酸盐污染水平较低，铬含量相对较高。

The effect of Ti on the microstructure of the 4wt%C-20wt%Cr hypereutectic high-chromium cast iron was studied in this paper.

研究了不同的含Ti量对4C-20Cr过共晶高铬铸铁显微组织的影响。

Under certain temperature of slurry, the semi-solid microstructure with certain shape and size was obtained, with which both impact toughness and wear resistance of hypereutectic high chromium cast iron were enhanced.

在合适的半固态浆料温度下，可以制备出具有一定尺寸和形状的半固态组织，不仅有利于提高过共晶高铬铸铁的韧性，而且也有利于提高其耐磨性。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。