In a certain room，all except 18 of the people are over 50 years of age．If 15 of the people in the room are under 50 years of age，how many people are in the room？（） A: 27 B: 30 C: 33 D: 36 E: It cannot be determined from theinformation given．

下面哪一个表达式能正确表示逻辑关系："age≥18 或age≤60"？ A: age>=18 || age B: age>=18 or age C: age>=18 | age D: age>=18 && age

表达式“AGE BETWEEN 18 AND 24”等价于 A: AGE>18 AND AGE<24 B: AGE>=18 AND AGE<24 C: AGE>18 AND AGE<=24 D: AGE>=18 AND AGE<=24

设有关系表S(NO，NAME，AGE)，其中AGE为年龄字段，则表达式AGE NOT BETWEEN 18 AND 24等价于（） A: AGE＜=18 OR AGE＞=24 B: AGE＜=18 0R AGE＞24 C: AGE＜18 OR AGE＞=24 D: AGE＜18 0R AGE＞24

与WHERE AGE BETWEEN 18 AND 23完全等价的是（） A: WHERE AGE＞18AND AGE＜23 B: WHERE AGE＞＝18AND AGE＜23 C: WHERE AGE＞18AND AGE＜＝23 D: WHERE AGE＞＝18AND AGE＜＝23

同WHERE Age BETWEEN 15 AND 20完全等价的是（ ）。 A: WHERE Age>;15 AND Age<;20 B: WHERE Age>;=15 AND Age<;20 C: WHERE Age>;15 AND Age<;=20 D: WHERE Age>;=15 AND Age<;=20

设有关系表S(NO,NAME,AGE),其中AGE为年龄字段,则表达式 A: E  NOT  BETWEEN  18  AND  24  等价于： B: AGE<=18  OR  AGE>=24 C: AGE<=18  OR  AGE>24 D: AGE<18  OR  AGE>=24 E: AGE<18  OR  AGE>24

In which age did Trojan War take place? A: the Silver Age B: the Bronze Age C: Age of Heroes D: the Iron Age

In which age was human destroyed by Zeus with the flood ofDeluge? A: the Silver Age B: the Bronze Age C: Age of Heroes D: the Iron Age

若是存在变量$ag=25，下而哪项中的代码不能输出"My age is 25"？( ) A: echo "My age is".Sage B: echo "My age is $age" C: echo 'My age is $age'; D: echo "My age is "."$age";