21.certificate on performance tests of packing 包装性能检验证书
performance n.（常与of连用）表现性能；能力；成绩，工作成果表演；扮演；演奏
Her performance in the play was very good.她在剧中的表演非常好。
The performances are on the 5th and 6th of this month.剧的）上演是在这个月的5号和6号。
packing n.包装， 打包； 装箱
22.certificate for doping silk classification and conditioned weight
双宫丝品级及公量检验证书
duping n.[纺]双宫丝
classification n.分类， 分级
account classification帐户（科目）分类
activity classification业务活动分类
conditioned weight n. 公量
23.certificate for raw silk classification conditioned weight 生丝品级公量检验证书
raw silk n.生丝
24.certificate for spun silk yarn quality 绢丝品质检验证书
spun silk n.绢丝
yarn n.纱， 纱线， 故事， 奇谈
quality n. -ties品质；性质
a watch of good quality品质好的手表
This new model is of high quality and is not expensive either.这种新型号质量非常好，而且也不贵。
a poor quality of cloth品质低劣的布料
qualities of leadership领导才能
25.certificate for thrown silk classification and conditioned weight 捻线丝品级及公量检验证书
thrown throw的过去分词
thrown silk 捻线丝
26.certificate of aflatoxin 黄曲霉毒素检验证书
aflatoxin n.[生化]黄曲霉毒素
27.certificate of analysis 分析检验证书
analysis n.-ses分析；分解 http://ks.exam8.com
chemical analysis化学分析
an analysis of the milk对牛奶的分析
The analysis of the samples on the murder spot showed some valuable clues to the police.对谋杀现场标本的分析为警察提供了一些有价值的线索。
28.certificate of cargo G.A. 共同海损鉴定证书
cargo n.船、飞机 所载的）货物
We sailed from Perth with a cargo of raw ion.我们装着一船生铁从佩思启航。
a cargo of cotton 船棉花
a cargo of oil 飞机油
29.certificate of depth 深度检验证书
depth n.深度；浓度；深
What is the depth of the well？这口井的深度是多少？
Nobody knew the depth of her love for the child.谁也不知道她对这孩子的爱有多深。
中央；中间
in the depths of winter在隆冬
30.certificate of disinfection 消毒检验证书
disinfection n.消毒（作用）； 灭菌（作用）