【单选题】A constant output voltage from an AC generator is maintained by the _____.
【简答题】读图,完成题。 小题1:图示国家是 A.美国 B.俄罗斯 C.澳大利亚 D.中国 小题2:该国西部 A.有其所在大洲最长的河流 B.有其所在大洲流经国家最多的河流 C.有世界上面积最大的淡水湖泊 D.有世界上最深的淡水湖泊 小题3:关于图示国家经济的叙述,正确的是 A.矿产资源不能自给,需要大量进口 B.轻重工业并重,都较发达 C.农产品出口量大 D.交通运输以铁路为主
【简答题】读澳大利亚矿产分布示意图,分析回答以下各题: (1)澳大利亚矿产资源丰富,被称为“坐在矿车上的国家”,其中,占世界重要地位的矿产是_______和_______。 (2)澳大利亚有很多矿产出口到_______等国,我国上海的宝山钢铁基地也从澳大利亚进口_______(矿产)。 (3)澳大利亚的首都是图中的_______(A或B),海边建有著名歌剧院的城市是_______,该城市是澳大利亚最大的__...
【单选题】The output voltage, VO, is given by ______.【图片】
【单选题】Refer to Figure 12-9. Thefirm experiences constant returns to scale at which output levels?
A.
output levels less than M
B.
output levels between M and N
C.
output levels greater than N
D.
All of the above are correct as long as the firm is operating in the long run.
【简答题】澳大利亚是世界重要的矿产品出口国,主要有 铁和铝土等
【单选题】Assuming fixed costs are positive, over a range of output in which average total costs were constant,
A.
average variable costs would be constant as output increases.
B.
average variable costs would be falling as output increases.
C.
average variable costs would be rising as output increases.
D.
marginal cost would be less than average variable cost.
【单选题】The output voltage, VO, is given by _______.【图片】
【单选题】An increase in expected future output while holding today's output constant would
A.
increase today's desired consumption and increase desired national saving.
B.
increase today's desired consumption and decrease desired national saving.
C.
decrease today's desired consumption and increase desired national saving.
D.
decrease today's desired consumption and decrease desired national saving.