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二 选择题(正确的打√;错误的打×)1 亚共析钢是两相组织,一个相是铁素体,另一个相是珠光体.( )2 组织中的树枝状或多面体状组成物,无论是单相或几个相的混合物.这种组成物一定是最先凝固成的.( )3 显微组织中的明暗度不同的两部分,一定是两个不同的相.( )4 共晶体是两相或更多的相的混合物.所以凡是组织中的两相均匀混合物都是共晶体.( )5 观察组织时,凡是组织中的黑色物都可以把这种组成物判为是一个相.( )6 合金组织中的每一种组成物都是某种转变的产物.所以合金液冷却过程中有几种类型的转变,所得组织就有几种组成物.( )7 不同组成物的分布不同,所以合金组织中存在几种不同分布的部分就有几种组成物.( )
Alternatives (correct ticking; wrong ticking) 1 The hypo-eutectoid steels are two-phase structures, one phase being ferrite and the other phase being pearlite. (2) The dendritic or polyhedral shape in the The material, whether it be a single phase or a mixture of phases, must be the first to solidify. () 3 The two parts of the microstructure that have different shades of darkness must be two different phases. 4 A co-crystal is a mixture of two or more phases, so any homogeneous mixture of two phases in a tissue is co-crystal. (5) When observing a tissue, all black matter in the tissue can be judged as () 6 Each composition in the alloy is a product of some transformation, so there are several types of transformations that occur during the cooling of the alloy and the resultant structure has several compositions. The composition of the distribution of different, so there are several different parts of the alloy organization there are several components ()