前锋线比较法适用施工进度计划用()表达。
A.双代号网络图
B.单代号网络图
C.时标网络图
D.横道图
参考答案:C
对于学生信息表:student(sno,sname,sex,age,dept),能够得到年龄在20岁于22岁之间的学生的姓名和学号的语句是
A.SELECT * FROM student WHERE age BETWEEN 20 AND 22
B.SELECT sname,sno FROM student WHERE age BETWEEN 20 AND 22
C.SELECT sname,sno FROM student WHERE age>=20
D.SELECT sname,sno FROM student WHERE age<=22
方兴未艾fünɡ xìnɡ wâi ài