设s=’I AM A STUDENT’,t=’GOOD’,q=’WORKER’。求:答:StrLength是字符串长度,SubString(s,8,7)是截取s,第8个开始,截取7个字符。Strlength (S) = 14 SubString(⊂,s,8,7) = 'student'Replace(&s,'student',Q) = 'I am a worker'Concat(&p,T,SubString(&W,S,7,8)) = 'a student'空格串表示只含空格的串。空串表示所含字符...