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When he arrived in America, he was surprised to learn that the mayor of the city was Chinese by ______.
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There are few more sobering online activities than entering data into college-tuition calculators and gasping as the Web spits back a six-figure sum, But economists say families about to go into debt to fund four years of partying, as well as studying, can console themselves with the knowledge that college is an investment that, unlike many bank stocks, should yield huge dividends. A 2008 study by two Harvard economists notes that the "labor-market premium to skilr " —or the amount college graduates earned that’s greater than what high-school graduates earned—decreased for much of the 20th century, but has come back with a vengeance since the 1980s. In 2005, the typical full-time year-round U.S. worker with a four-year college degree earned $ 50,900, 62% more than the $ 31,500 earned by a worker with only a high-school diploma. There’s no question that going to college is a smart economic choice. But a look at the strange variations in tuition reveals that the choice about which college to attend doesn’t come down merely to dollars and cents. Does going to Columbia University (tuition, room and board $ 49,260 in 2007-2008) yield a 40% greater return than attending the University of Colorado at Boulder as an out-of-state student( $ 35,542) Probably not. Does being an out-of-state student at the University of Colorado at Boulder yield twice the amount of income as being an in-state students( $17,380) there Not likely. No, in this consumerist age, most buyers aren’t evaluating college as an investment, but rather as a consumer product—like a car or clothes or a house. And with such purchases, price is only one of many crucial factors to consider. As with automobiles, consumers in today’s college marketplace have vast choices, and people search for the one that gives them the most comfort and satisfaction in line with their budgets. This accounts for the willingness of people to pay more for different types of experiences(such as attending a private liberal-arts college or going to an out-of-state public school that has a great marine-biology program). And just as two auto purchasers might spend an equal amount of money on very different cars, college students(or, more accurately, their parents)often show a willingness to pay essentially the same price for vastly different products. So which is it What is the chief consideration when students choose a college today
请使用VC6或使用[答题]菜单打开考生文件夹proj3下的工程文件proj3。本题创建一个小型字符串类，字符串长度不超过100。程序文件包括proj3.h、proj3.cpp、writeToFile.obj。补充完成proj3.h，重载复合赋值运算符+=。 要求： 补充编制的内容写在“//********333********”与“//********666********”之间，不得修改程序的其他部分。 注意：程序最后将结果输出到文件out.dat中。输出函数writeToFile已经编译为obj文件，并且在本程序中调用。 //proj3.h #include ＜iostream＞ #include ＜iomanip＞ using namespace std; class MiniString {public: friendostream &operator ＜＜ (ostream&output, const MiniString &s ) {output ＜＜ s.sPtr; return output; } friend istream &operator ＞＞ ( istream&input, MiniString &s ) {char temp [100]; //用于输入的临时数组 temp[0] = ’\0’; input ＞＞ setw(100 ) ＞＞ temp; int inLen = strlen(temp); //输入字符串长度 if( inLen!= 0) { s.length = inLen; //赋长度 if( s.sPtr! = 0) delete []s.sPtr; s.sPtr = new char [s.length + 1]; strcpy( s.sPtr, temp ); //如果s不是空指针，则复制内容 } else s.sPtr [0] = ’\0’; //如果s是空指针，则为空字符串 return input; } MiniString ( const char * s=""):length (( s!= 0 )strlen(s) : 0 ){ setString(s ); } ～MiniString() { delete [] sPtr; }//析构函数 //************* 333*********** //+=运算符重载 //************* 666*********** private: int length; //字符串长度 char * sPtr; //指向字符串起始位置 void setString( const char * string2 ) //辅助函数 { sPtr = new char [length + 1]; //分配内存 if ( string2 ! = 0 ) strcpy( sPtr, string2 ); //如果string2不是空指针，则复制内容 else smtr [0] = ’\0’; //如果string2是空指针，则为空字符串 } }; //proj3.cpp #include ＜iostream＞ #include ＜iomanip＞ using namespace std; #include "proj3.h" int main () { MiniString str1 ("World"), str2 ("Hello") ; void writeToFile (char * ) ; str2 + = str1; //使用重载的+=运算符 cout ＜＜ str2 ＜＜ "\n"; writeToFile (""); return 0; }
用两种不同成分的培养基(分别为701批与702批)分别培养鼠疫杆菌，重复试验单元数为5个，将48小时内各试验单元上生长的活菌数记录如下701批：48 84 90 123 171；702批：90 116 12 422 584。那么该资料的类型为
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