【单选题】如果学生表STUDENT是使用下面的SQL语句创建的: CREATE TABLE STUDENT(SNO C(4) PRIMARY KEY NOT NULL,,; SN C(8),; SEX C(2),; AGE N(2) CHECK(AGE>15 AND AGE<30)) 下面的SQL语句中可以正确执行的是( )。 A
【简答题】Be brainy, be bilingual 双语能增强大脑能力 Learning a second language can boost brain power, scientists believe. US researchers from Northwestern University say bilingualism is a form of brain training - a men...