( 1 ) the economic characteristics decide the development of world aquaculture . because of the character of denseness of resource and labour , countries which have longer coastline , more population and which are not developed have high output of aquatic product . because of the nature of aquatic consume , the demand of aquatic product is high , while less resources are allot in aquaculture in developed country , which decides the activity of international trade of aquatic , high value aquatic product favor to developed countries . because the high increase of world population , aquatic resource crock up increasingly . the output of aquatic product ca n ' t increase high in a longer time , but with the advance of 由于水产品生产的资源和劳动密集特征,沿海海岸线长、人口多、欠发达国家水产品产量高,发达国家、海岸线短、内陆水资源相对稀缺的国家水产品产量低。由于水产品消费具有两重性、水产品需求弹性大的特点,发达国家对水产品需求量大,而发达国家的资源较少分配到水产品生产上,这就决定了水产品国际贸易比较活跃,并且高价值水产品流向发达国家。由于水产品的易腐特性,国际水产品贸易主要品种为水产加工品。
In order to make the retailer ' s pricing decision reflect the quality fluctuation of perishable foods , the bundling selling model based on the shelf life for perishable foods was established by taking pasteurized milk as illustration after effectively partitioning customer - groups among the whole market 摘要为了使零售商的价格决策能反映易腐食品的质量波动，在分析微生物预测模型及有效划分市场消费群的基础上，以巴氏奶为例建立了基于货架期的易腐食品捆绑销售模型。
Articles which cannot be packed in the checked baggage passengers are not allowed to pack in the checked baggage confidential documents , classified materials , diplomatic mail bags , negotiable securities , currencies , money orders , valuables , vulnerable and perishable articles and other articles needed in special custody 不准在托运行李内夹带的物品旅客不得在托运行李内夹带机密文件、资料、外交信贷、有价值证券、货币、汇票、贵重物品、易碎易腐物品、以及其他需要专人保管的物品。
