【单选题】生物群落
【判断题】铸铁用粘土湿砂必须全部采用新砂混合砂。
铸造热应力的最终结果是薄壁或表面受拉。
【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( )。
【判断题】压实造型时，压实比大于压实 O.7 MPa 称为高压造型。
【多选题】妊娠期妇女乳房的特点是
浇注位置是指造型时的浇注位置( )它影响铸件的质量。
【判断题】铸件上的宽水平面浇筑时应朝下。
生物群落的一般概念是
【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。
【单选题】生物群落
【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。
灰铸铁主要用于填空( )形式存在，呈( )状。
【填空】球墨铸铁中石墨呈现 ( ) 状。
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】~とはいえ
群落的基本特征是什么？
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。
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。
【单选题】~ものの
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 from 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.
自定义图案时，正确的操作步骤是( )。
【填空】可锻铸铁中石墨呈现( )状。
【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。
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
铸件浇铸位置的选择必须正确，如重要工面、大平面和薄壁部分在浇铸时应尽量( ),而厚大部位应尽量( ),以便安放冒口进行( )。
【填空题】影响铸铁石墨化最主要的因素是( )和( )。
【判断题】化学粘砂层中的金属氧化物越厚,越难清理。
【填空题】水玻璃砂存在的突出问题是( )、( )、( )和( )等。
【单选题】如图所示,要将一条波动的曲线处理成重复的网状纹理效果,精确而快捷的制作方法是( )。
【填空题】碳在铸铁中的存在形式有( )和( )。
【单选题】~た上で
【单选题】~をはじめ
【填空题】铸造应力按产生的原因不同,主要可分为( )和( )( )三种。
【填空题】根据石墨形态,铸铁可分为( )、( )、( )和( )。
【填空题】镁砂是菱镁矿高温锻烧冉经破碎分选得到的,主要成分是( )。
【填空题】水玻璃砂的常用物理再生方法包括( )和( )两种。
【填空题】对砂型铸件进行结构设计时,必须考虑合金的( )和铸造( )对铸件结构提出的要求。
【简答题】如何理解软件生命周期的内在特征?
【单选题】在使用GIF方式优化图像时,选择下列参数中的( )可以指定图像中透明像素的优化方式。
【填空题】目前,用树脂砂制芯时主要有 3 种硬化方式,即( )、( )和( )。
【判断题】化学粘砂是铸件表面粘附一层由金属氧化物、砂子、粘土相互作用而生成的低熔点化合物。
【填空题】水玻璃砂硬化的方式有( )和( )等。
【判断题】热芯盒工艺中的树脂砂的强度高低,主要决定于树脂本身的性质,但也与原砂质量、芯盒温度、混制质量等有关。
【填空题】开放式浇注系统,内浇口应置于横浇口( )端。
【判断题】铸件的主要加工面和重要的工作面浇注时应朝上。
【填空题】影响合金充型能力的因素有( )、( )、( )。
【单选题】将图像存储为JPEG格式时,【品质】参数可以设置从0~12之间的数值,当数值设置越大,图像在压缩时( )。
【单选题】Inspectors were appointed to _____ into the affairs of the company.
【填空题】封闭式浇注系统,内浇口应置于横浇口( )部。