解析 【答案】Metal【核心短语/词汇】substance物质【翻译】金属是一种坚硬的物质,例如铁、钢、金或者铅。【解析】根据括号中的提示词可知,这里需要填“金属”这一单词,其英文表达是“metal”,由于系动词是“is”,属第三人称单数形式,故主语“metal”也要用单数形式。
Is distilled water a substance or a mixture? Explain. substance:Substances are matters that are made up of specific compositions and have distinctive properties. Examples of substances are pure elements or compounds such as water.Answer and Explanation: ...
material, matter,substance5. Steel is a mixture of iron and other6. That is a of principle.7. Tell us the of your activity.8. This suit is made of very good 相关知识点: 试题来源: 解析 5. substances 6. matter 7. substance 8. material ...
Answer to: Determine whether the statement is a pure substance or mixture. List all of the different phases present: partially molten iron By...
An iron of the cluster may bind the substrate and act as Lewis acid for the elimination of the hydroxy group. The reaction involves most probably an allylic anion 90 as intermediate that can be protonated at C-2 yielding IPP 2 or at C-4 yielding DMAPP 3 (Figure 16). When the HMBPP...
The titanium compound is preferably comprised of TiO 2 . Iron oxide can be added as an accompanying substance.Djamschid Amirzadeh-AslDieter FündersUS
In some cases, the BL systems can have not enough sensitivity to detect a toxic substance at its Maximum Permissible Concentration. but they result the quicker, or more convenient, bioassays. This is the case, for example of deltamethrin determination. The sensitivity of the BLB test was hig...
Answer and Explanation: Brass is not a pure substance. It is an alloy, which is a mixture of two or more metals. Specifically, brass is usually made up of copper and zinc... Learn more about this topic: Alloy | Definition, Types & Examples from...
to form a compound. During a chemical reaction, two or more chemical molecules interact and change. Take a steel garbage can, for instance: when the iron in the garbage can interacts with the oxygen in the atmosphere, a chemical reaction occurs and the substance we call “rust” is created...
The allergen used for immunotherapy may be a single allergenic substance or a mixture of such substances, for example a mixture of proteins. It may be a partially or fully purified extract, such as a pollen extract, a recombinant protein, a hypoallergen or peptide derived therefrom. For exampl...