The economist who first proposed the conflict between internal and external equilibrium under a fixed exchange rate system is（）
A. Robert Mundell
B. J. Meade
C. J. Tinbergen
D. Keynes
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（）are the factors influencing the changes in the International Investment Position
A. financial account transactions
B. Other changes in volume
C. price changes
D. Exchange rate changes
下面关于串的的叙述中，哪一个是不正确的:Which of the following descriptions about string is not correct？ （There is only one correct answer）（）
A. 串是字符的有限序列 String is a finite sequence of characters
B. 模式匹配是串的一种重要运算 Pattern matching is an important operation
C. 串是一种数据对象和操作都特殊的线性表 String is a linear list whose data objects and operations both special
D. 空串是由空格构成的串 Empty string is a string consisting of spaces
The key features of a protocol are: syntax, semantics and__（）
A. presentation
B. timing
C. network access
D. peer layering
下列说法正确的是：Which of the following statements is correct？ （There is only one correct answer）（）
A. 空串就是空白串“Empty string” is blank string
B. 空串是任意字符串的子串 Empty string is a substring of arbitrary string
C. 串只可以采用顺序存储，不可以采用链式存储 String only can be stored in sequential method and cannot be stored in linked method
D. 在C++标准中，char S[M]最多能表示长度为M的字符串 In C ++ standards, char S[M] can represent up to a string of length M
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