已选分类
工学
判断题铁素体软而韧,而渗碳体硬而脆,由此两相组成的铁碳合金的性能取决于二者配合的显微结构。
判断题Composites can be designed to have isotropic properties, or anisotropic properties.
判断题多晶体材料塑性变形至少需要3个独立滑移系开动。
判断题Thermoplastic adhesives are generally serviceable at temperatures above the thermosets.
判断题A material exhibits an endurance limit
判断题在不平衡条件下凝固,共晶成分附近的合金易于形成离异共晶。
判断题Use landfilling method to treat MSW is the least desirable but the most common method.
判断题同一滑移面上位错线平行的异号刃型位错,相互作用结果使位错彼此远离。
判断题刃位错的位错线垂直于滑移方向。
判断题高速钢中,粗大的鱼骨状碳化物,可以通过热处理来消除。
判断题0Cr18Ni9中,ωC=0。
判断题在宏观晶体中只存在32种不同的对称型。
判断题非化学计量化合物结构缺陷也是一种杂质缺陷。
判断题无论温度分布如何,纯金属都是以树枝状方式生长。
判断题All materials do not have endurance limit.
判断题金属化合物的强度、硬度高,而塑性、韧性差。
判断题Acrylonitrile-butadiene rubber (NBR) and Fluoroelastomers have excellent resistance to oil, kerosene, and gasoline.
判断题等轴晶系的对称特点是具有4根3次轴。
判断题One of the functions of a matrix used in polymer matrix composites is to reduce the number of voids.
判断题Designers must consider creep strength as a basis for a structural design when a part is subjected to a sustained load in service.
