【简答题】600K 时,实验测定环丁烷的分解反应的半衰期与起始浓度无关,且半衰期等于 6.1×10 3 h ,那么在此温度下当环丁烷分解了 80% 时用时 h 。
【简答题】简述内墙涂料与外墙涂料在功能与性能要求上的区别。
【单选题】Suppose a new vaccine for Lyme disease is developed by Merck, a large drug company. Which of the following is most likely to occur?
A.
Merck will apply for a patent on the vaccine that grants it the monopoly rights to the vaccine for many years.
B.
Merck will have a monopoly on this vaccine because of economies of scale.
C.
Other firms will quickly copy the formula making the market for the vaccine competitive.
D.
Merck will not tell anyone about its discovery though it will sell the vaccine.
【简答题】简述内墙涂料与外墙涂料在功能与性能要求上的区别。
【简答题】By and large, people in the United States suppose that people from other cultures also dislike poverty and value hard work.