Parents have a legal ________ to ensure that their children are provided with efficient education suitable to their age._

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";