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【单选题】
TCP/IP协议包括_______、互联层、传输层和应用层。A.
会话层
B.
表示层
C.
物理层
D.
网络接口层
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反馈参考答案：
举一反三
【单选题】If there is perfect negative correlation between two sets of numbers, then _______.
A.
r = 0
B.
r = -1
C.
r = +1
D.
SSE=1
E.
MSE = 1
【单选题】If there is perfect certainty, a competitive firm will necessarily:
A.
seek to maximize its immediate profits rather than long run returns because otherwise it will go broke.
B.
maximize the ratio of the present value of its sales to the present value of its costs.
C.
equalize its profits in all periods.
D.
equalize its sales in all periods.
【简答题】(1)酸雨的PH值一般是小于 ____的天然降水。酸雨主要是人为的向大气中排放大量的二氧化硫和氮氧化物等物质所造成的,酸雨中的绝大部分是硫酸和硝酸; 请同学们写出二氧化硫与水反应的方程式:____
【单选题】The figure given below shows a situation where the producers of good X are forming an international cartel. Here, MR = Marginal Revenue, MC = Marginal Cost, and P = Price. The cartel use monopoly pri...
A.
B.
C.
D.
D
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