【填空题】ZG200-400 中 “ZG 表示 ( ) ,数 字 400 表示 ( ) 。 HT150 表示 ( ). QT450-10 的含义 ( ). , KTH300-06 表示( )。
【填空题】铸件各部分壁厚差异较大，冷却至室温。厚壁的残余应力为( )薄壁部分的残余应力为( )应力。
灰铸铁主要用于填空( )形式存在，呈( )状。
【判断题】化学粘砂层中的金属氧化物越厚,越难清理。
【填空题】水玻璃砂硬化的方式有( )和( )等。
【单选题】~とはいえ
【单选题】生物群落
生物群落的一般概念是
单选题在以下工具箱中的选择工具中，可以用来定义图案( )。
【单选题】~ものの
【单选题】生物群落
浇注位置是指造型时的浇注位置( )它影响铸件的质量。
用于热芯盒工艺的树脂砂发气量大，但发气速度快，因此，砂芯不需要加强排气措施。
【填空】水玻璃砂的突出问题是( )、( )、( )和( )等。
【填空】铸件应力过大会导致铸件应力过大 ( ) 等待缺陷。因此，在设计铸件结构时应注意铸件( )尽量均匀。
影响自硬砂使用时间和起模时间的因素主要是砂温和环境温度。
铸铁中碳的存在形式有( )和( )。
水玻璃砂常用的物理再生方法包括( )和( )两种。
铸铁根据石墨形态可分为石墨形态( )、( )、( )和( )。
【判断题】对于粘土湿砂，当水分合适时，粘土含量越高，强度越高。
【填空题】铸造应力原因，主要可分为( )和( )( )三种。
【单选题】Inspectors were appointed to _____ into the affairs of the company.
如图所示，要将波动曲线处理成重复的网状纹理效果，准确快捷的制作方法是( )。
【判断题】铸铁用粘土湿砂必须全部采用新砂混合砂。
【多选题】孕妇乳房的特点是
镁砂是由菱镁矿高温锻烧冉破碎分选而成，主要成分为( )。
【填空题】开放式浇筑系统，内浇口应放置在横浇口( )端。
在使用中GIF在优化图像时，选择以下参数( )图像中透明像素的优化方法可以指定。
化学粘砂是由金属氧化物、砂、粘土相互作用产生的低熔点化合物。
【单选题】~をはじめ
【填空题】铸件浇铸位置的选择必须正确，如重要加工面、大平面、薄壁等，浇铸时应尽量选择( ),而且厚的部位要尽量( ),为了安装冒口( )。
【填空题】封闭式浇筑系统，内浇口应放置在横浇口( )部。
【判断题】铸件上的宽水平面浇筑时应朝下。
【填空题】砂型铸件的结构设计必须考虑合金( )和铸造( )对铸件结构的要求。
影响合金充型能力的因素有( )、( )、( )。
【填空】球墨铸铁中石墨呈现 ( ) 状。
铸造热应力的最终结果是薄壁或表面受拉。
铸件的主要加工面和重要工作面应向上浇筑。
【填空题】目前主要有树脂砂芯 3 硬化方法，即( )、( )和( )。
单选题将图像存储为JPEG格式时，可以从0设置质量参数~当数值设置越大，图像压缩时，12之间的值( )。
【单选题】~た上で
【判断题】压实造型时，压实比大于压实 O.7 MPa 称为高压造型。
群落的基本特征是什么？
在玻璃上 ( 折射率 n 3 = 1.60) 表面镀一层 MgF 2 ( 折射率 n 2 = 1.38) 薄膜作为增透膜.使波长为 500 nm 的光从空气 ( n 1 = 1.00) 尽量少反射正入射， MgF 2 薄膜的最小厚度应为
【判断】热芯盒工艺中树脂砂的强度主要取决于树脂本身的性质，但也与原砂质量、芯盒温度、混合质量有关。
影响铸铁石墨化的主要因素是( )和( )。
如何理解软件生命周期的内在特征？
阅读理解What is renewable energy? Renewable energy is energy that is environment -friendly because it is collected from renewable resources, which are naturally replenish ed. Examples of these renewable resources include sunlight, wind, rain, tides, waves, and geothermal heat (i.e.the thermal energy generated and stored in the Earth). There is a distinction between renewable energy and alternative energy . The latter is generate d from alternatives to fossil fuels and need not be renewable. Renewable energy often supplies energy in four essential sectors: · The generation of electricity; · Cooling and heating of air; · Means of transport, · Rural energy services. Investing in renewable energy Global investments in renewable technologies were estimated to be more than US$286 billion in 2015. Countries like China and the United States invest heavily in wind, hydro, solar and biofuels. Globally, there are an estimated 7.7 million jobs associated with the renewable energy industries, with solar photovoltaics being the largest renewable employer. As of 2015 worldwide, more than half of all new electricity capacity installed was renewable. Benefits of renewable energy There are a lot of benefits to using renewable energy. First, naturally replenished energy resources are found over wide geographical areas, in contrast to non-renewable resources , which exist only in a limited number of countries. In addition to that, rapid deployment of renewable energy and energy efficiency is resulting in significant energy security, climate change mitigation , and economic benefits. The results of a recent review of the literature concluded that as greenhouse gas emitters begin to be held liable for damages resulting from greenhouse gas emissions resulting in climate change, a high value for liability mitigation would provide powerful incentive s for deployment of renewable energy technologies. There are other undeniable advantages of renewable energy. Renewable technologies are also suited to rural and remote areas and developing countries, where energy is often crucial in human development. Former United Nations Secretary-General Ban Ki-moon has said that renewable energy has the ability to lift the poorest nations to new levels of prosperity . Besides, as most renewables provide electricity, renewable energy deployment is often applied in conjunction with further electrification, which has several benefits: · Electricity can be converted to heat (where necessary generating higher temperatures than fossil fuels); · Electricity can be converted into mechanical energy with high efficiency; · Electricity fro renewable resources is clean at the point of consumption. Deployment of renewable energy In international public opinion surveys, there is label support for promoting renewable sources such as solar power and wind power. At the national level, at least 30 nations around the world already have renewable energy contributing more than 20 percent of energy supply. National renewable energy markets are projected to continue to grow labelly in the coming decade and beyond. Some places and at least two countries, Iceland and Norway generate all their electricity using renewable energy already, and many other countries have set a goal to reach 100% renewable energy in the future. For example, in Denmark, the government decided to switch the total energy supply (electricity, mobility and heating/cooling) to 100% renewable energy by 2050. Conclusion Renewable energy systems are rapidly becoming more efficient and cheaper. Their share of total energy consumption is increasing. Growth in consumption of coal and oil could end by 2020 due to increased uptake of renewables and natural gas.
【单选题】自定义图案时,正确的操作步骤是( )。
【填空题】可锻铸铁中石墨呈( )状。