计算：173+183+193+203+…+263=（)。A．104705B．116704C．105029D．118027

A.CONCAT

B.TRIM

C.SUBSTRING

D.LOCATE

A．"abc,,,bcd,,def,efg,,".split("[,]+").length == 4;

B． "1st456".matches("\\d[a-z&&[^et]]{2,8}[0-9]+");

C． "abcdefghijklmnopqrstuvwxyz".substring(5,26).length() == 20;

D． "whatisjava".equals(null);

表达式的输出结果是()。

A def

B "def"

C abc

D "abc"

A．mkdir abc/def

B．mkdir /abc/def

C．mkdir -p /abc/def

D．mkdir -p ./abc/def

下面哪段程序建立了5个空字符串。Which correctly create an array of five empty Strings？

A、Stringa[]=newString[5];for(inti=0;i<5;a[i++]="")

B、Stringa[]={"","","","","",""}

C、Stringa[5]

D、String[5]a

E、String[]a=newString[5];for(inti=0;i<5;a[i++]=null)

A．cp -R /abc/def

B．cp /abc/def .

C．cpdir /abc/def .

D．cp -R /abc/def .

A．gets(str); // 在键盘输入：ABC DEF

B．str="ABC DEF";

C．strcpy(str, "ABC DEF");

D．char str[100]= "ABC DEF";

已知abc∥dfe，则平面ABC与平面DEF平行。