【判断题】边际效用为零时总效用最大,边际效用小于零时,总效用开始减少。
【判断题】当边际效用为正时,总效用上升;边际效用为零时,总效用达到最大;当边际效用为负时,总效用下降。
【判断题】边际效用为正时,总效用增加;边际效用为零时,总效用最大;边际效用为负时,总效用递减。
【单选题】正确选用劳动保护用品是保证劳动者安全与健康的前提,下列不属于选用劳动保护用品的基本原则是( )
【简答题】Microbiology has not only made important contributions to many disciplines but also affected both medicine and pharmacy a lot. Medical microbiology is the study of the pathogenic microbes and the role...
【简答题】The food we eat seems to have a great effect on our health. Although science has made big steps in food more fit to eat, it has, at the same time, made many foods unfit to eat. Some research ha...
【简答题】阅读理解。 The food we eat seems to have a great effect on our health. Although science has made big steps in food more fit to eat, it has, at the same time, made many foods unfit to eat. Some resea...
【单选题】“精力旺盛、表里如一、刚强易感情用事”属于()