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土壤是一个疏松多孔体，既有颗粒与颗粒之间的粒间孔隙，也有团聚体与团聚体之间的结构孔隙。孔隙的大小、几何形状、多少以及在土壤不同层次中分配关系都是极为复杂的。所以，土壤孔隙具有发生学特征和意义。 土壤孔隙担负着保存水分和通气（气体交换）双重功能。孔隙大小和多少对于协调土壤水气矛盾至关重要。土壤孔隙是微生物活动的场所，是植物根系伸展的主要通道。可见，孔隙性状是土壤的重要质量指标

一、 有机磷农药特性(Specific Properties) 1．化学基本结构(Chemical basic structure) 2．理化特性(Physical and Chemical Property)

1. Brief Introduction on Central Bank Four Players in Money Supply Process Structure of Central Banks and the Federal Reserve System The Fed’s Balance Sheet

10.1 结构(Structure) 10.2 位域(Bit_Fields) 10.3 联合(Unions) 10.4 枚举(Enumerations)

The important of acid-base reaction: 1. is a simple, fundamental reaction. 2. enable you to see the mechanism of the reaction 3. illustrate the process of bond breaking and bond making 4. examine important ideas about the relationship between the structure of molecules and their reactivity

1 Ultraviolet Spectroscopy (uv) 紫外光谱----测定有机物中是否存在共轭双键和芳香族化合物 2. Infrared spectroscopy (IR)红外光谱----测定有机物中官能团

◼ What are the main challenges of translation and how do organisms overcome them? ◼ What is the organization of nucleotide sequence information in mRNA? ◼ What is the structure of tRNAs, and how do aminoacyl tRNA synthetases recognize and attach the correct amino acids to each tRNA? ◼ How does the ribosome orchestrate the translation process?

Part I: Describe the following 10 terms (3 points each). (1) EF-G: a. its structure likes tRNA b. it is a translational elongation factor c. it binds to ribosome when associated with GTP