【单选题】Ms. Natalia Servoski Odvik Industries Olag, Ukraine Dear Ms. Servoski, I am writing to express my gratitude for your generous hospitality last week. I very much enjoyed having the opportunity to (90) ...
【简答题】人们因三鹿奶粉事件认识了三聚氰胺.三聚氰胺也被人称为“蛋白精”.长期或反复摄入大量的三聚氰胺可能对肾与膀胱产生影响,导致结石.三聚氰胺的化学式为C 3 H 6 N 6 .求: (1)三聚氰胺碳、氢、氧元素的质量比=______; (2)三聚氰胺中氮元素的含量是______.(精确至0.1%)
【单选题】Which of the following characteristics make an industry more conducive to collusive behavior?
A.
Firms in the industry have very different marginal costs of production.
B.
Firms in the industry produce goods with significantly different product attributes.
C.
Firms in the industry are operating at a maximum productive capacity that cannot be easily altered in the short run.
D.
Firms in the industry serve customers that can easily switch between firms as they search for the best price.
【单选题】部分不法商贩在奶粉中添加三聚氰胺的原因是?
【多选题】三聚氰胺也被人称为“蛋白精”.长期或反复摄入大量的三聚氰胺可能对肾与膀胱产生影响,导致结石.三聚氰胺的化学式为C 3 H 6 N 6 ,下列说法正确的是( )
A.
三聚氰胺中碳、氢、氮元素的质量比为6:1:14
B.
三聚氰胺中碳、氢、氮元素的个数比为1:2:2
【单选题】三聚氰胺被加入到奶粉中的最重要原因是()