有心绞痛者心肌侧支循环比较丰富，这显示心绞痛或心肌缺血可以促进侧支循环的形成，从而对冠心病人具有保护作用。运动可以诱发心肌缺血，因而许多冠心病患者不敢运动或许多医生也警告患者避免运动。但运动有可能通过诱发可逆性心肌缺血，促进侧支循环的形成，增加心肌自我保护...
Aromaticity: what does it mean? Aromaticity/aromatic belongs to one of the most useful and popular terms in organic chemistry and related fields. However, aromaticity is not an unambiguou... TM Krygowski,H Szatylowicz - 《Chemtexts》 被引量: 2发表: 2015年 Quasi-aromaticity-what does it...
What is tert in organic chemistry? Write all isomers for bromocycyclopentanol that are constitutional. What is physical organic chemistry? What is a polymer in organic chemistry? What is saytzeff rule in organic chemistry? What does NMR stand for in organic chemistry?
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Briefly describe the bonding around the oxygen atom in dimethyl ether. What intermolecular forces are found in this ether? What does chemical bonding mean in organic chemistry?Explore our homework questions and answers library Search Browse Browse by subject Ask a Homework Q...
Does a star undergo fusion or fission? What does nuclear binding energy mean and how do you know an atom has more than the others? What are safety issues that arise with nuclear fission and safety issues that arise with nuclear fusion? Give two each. What kinds of conditions are needed to...
What does it mean when the calorimeter constant is negative? The initial temperature of a bomb calorimeter is 28.50 C. When a chemist carries out a reaction in this calorimeter, its temperature decreases to 27.45 C. If the calorimeter has a mass of 1.400 kg and specific heat of 3.52 J/(...
Copper sulfate is also used in the production of batteries, as well as in electroplating and metal finishing processes. It is used as a catalyst in chemical reactions, and as a reagent in analytical chemistry. Despite its many uses, copper sulfate can be toxic if ingested or inhaled. It can...
(To be clear, Harden and the Rockets remain very much interested in the concept of a reunion, sources said.) How does Houston losing out on Wembanyama and falling to No. 4 impact their potential pursuit of Harden? Winning the lottery would have reoriented the entire franchise around ...
《特种设备使用管理规则》（TSG08-2017)规定，发生特种设备事故的使用单位，应当根据应急预案，立即采取应急措施，组织抢救，防止事故扩大，减少人员伤亡和财产损失，并且按照《特种设备事故报告和调查处理规定》的要求，向特种设备安全监管部门和有关部门报告，同时（）。