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若有说明char s1[30]="abc",s2[]="defghi";,则在使用函数strcat(s1,s2)后,结果是( )。

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s1的内容更新为abcdefghi  s1的内容更新为defghi/0  s1的内容更新为defghiabc/0  s1的内容更新为abcdefghi/0  
char**s1="aaaa","bbbb","cccc";  char*s2[3]="aaaa","bbbb","cccc";  char s3[][5]="aaaa","bbbb","cccc";  char s4[][4]="aaaa","bbbb","cccc";  
s1的内容更新为abcdefghi  s1的内容更新为defghi/0  s1的内容更新为defghiabc/0  s1的内容更新为abcdefghi/0  
char**s1={"aaaa","bbbb","cccc"};  char*s2[3]={"aaaa","bbbb","cccc"};  char s3[][5]={"aaaa","bbbb","cccc"};  char s4[][4]={"aaaa","bbbb","cccc"};  
typedef struct abc { double a; char b[10]; }s;  struct { double a; char b[10]; }s  struct ABC { double a; char b[10]; } ABCs;  typedef ABC { double a; char b[10]; } ABCs;  
char**s1="aaaa","bbbb","cccc";  char*s2[3]="aaaa","bbbb","cccc";  char s3[][5]="aaaa","bbbb","cccc";  char s4[][4]="aaaa","bbbb","cccc";  
(*f1)(;  *f1(*s);  fun(&a);  ch=*f1(s);  
char**s="AAA","BBB","CCC";  char*s[3]="AAA","BBB","CCC";  char s[][5]="AAA","BBB","CCC";  char s[][3]="AAA","BBB","CCC";  

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