皮皮学，免费搜题
登录
搜题
【判断题】
猪和鸡所吸收的AA种类和数量在很大程度上取决于饲料蛋白质的AA组成和比例。A.
正确
B.
错误
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】Economists normally assume that the goal of a firm is to( ) (1) sell as much of their product as possible (2) set the price of their product as high as possible (3) maximize profit
A.
(1) and (2)
B.
(2) and (3)
C.
(3)only
D.
All of the above are correct.
【判断题】气相色谱法测定环境空气和废气中有机氯农药和多氯联苯类化合物时，PUF吸附剂在初次使用前的净化方法之一是在索氏提取器中，依次使用甲苯、丙酮、二乙醚：己烷（1∶10）进行提取，然后进行真空干燥。
A.
正确
B.
错误
【多选题】使用索氏提取器进行固液提取,下列观点正确的有:
A.
利用了溶剂回流及虹吸原理，固体物质反复被纯溶剂浸润、萃取，效率较高
B.
无需拆解装置，相当于多次回流连续进行，方便快捷
C.
浸润的固体必需用滤纸等包裹起来，避免细小固体颗粒浮出，堵塞虹吸管
D.
滤纸筒中的固体不要高过虹吸管，否则萃取效果不理想
【单选题】Economists normally assume that the goal of a firm is to:
A.
sell as many units of output as possible.
B.
maximize profits.
C.
sell products at the highest prices possible.
D.
maximize sales revenue.
【单选题】Economists normally
A.
do not try to explain people's tastes, but they do try to explain what happens when tastes change.
B.
believe that they must be able to explain people's tastes in order to explain what happens when tastes change.
C.
do not believe that people's tastes determine demand, so they ignore the subject of tastes.
D.
incorporate tastes into economic models only to the extent that tastes determine whether pairs of goods are substitutes or complements.
【单选题】Economists normally assume that the goal of a firm is to
A.
maximize its total revenue.
B.
maximize its profit.
C.
minimize its explicit costs.
D.
minimize its total cost.
【单选题】Cheer up! Never let your failures _____ trying harder.
A.
put you through
B.
put you off
C.
put you across
D.
put you away
相关题目：
参考解析：
知识点：
题目纠错 0
发布
