layperson()
A.sage
B.proselytizer
C.nonspecialist
D.master
E.professional
NONSPECIALIST
A.sage
B.proselytizer
C.nonspecialist
D.master
E.professional
NONSPECIALIST
基因表达系列分析法(serial analysis of geneexpression,SAGE)
A.Pubmed 摘要型数据库
B.Web of Science 摘要型数据库
C.ochrane 全文型数据库/循证医学数据库
D.SAGE Backfile
E.ScienceDirect
F.OVID LWW
20世纪50年代初美国军方建立的半自动地面防空系统SAGE(Semi-Automatic Ground Environment)被看作是现代意义上的第一个计算机网络。()
基因表达系列分析技术(SAGE)的标签是_________;据其占总标签的比例可分析_________。
A.Y
B.N
C.NG
Which of the following statements can be inferred from the pas sage?
A.People used to make a pot of coffee in the morning and drink it up.
B.The new coffee makers usually cost less than before.
C.People used to drink coffee in larger quantities.
D.It is essential to attach a separate carafe, while "drip" coffee makers are applied.
关系数据库中有三个关系:
学生:S(Sno,Sname,Ssex,Sage, Sdept)其中:Sno:学号,Sname:姓名,Ssex:性别,Sage:年龄,Sdept:系名;
课程:C(Cno, Cname,Teacher)其中:Cno:课程号,Cname:课程名,Teacher:教师;
选课:SC(Sno,Cno,Grade)其中:Sno:学号,Cno:课程号,Grade:成绩,
用关系代数表达式实现下列1,2小题:
(1)检索年龄为19岁的女同学的学号和姓名
(2)检索不学课程号为“C135”课程的学生信息,包括学号,姓名和系名