下面列出的数据管理技术发展的三个阶段中，哪个(些)阶段有专门的软件对数据进行管理?
Ⅰ．人工管理阶段
Ⅱ．文件系统阶段
Ⅲ．数据库阶段
A.只有Ⅰ
B.只有Ⅱ
C.Ⅰ和Ⅱ
D.Ⅱ和Ⅲ

判断题混合编码将波形编码和参量编码结合起来，力图保持波形编码话音的高质量与参量编码的低速率。 正确 错误

未分类题在以下所列的条目中，哪些是数据库管理员(DBA)的职责?Ⅰ．负责管理企业的数据库资源Ⅱ．收集和确定有关用户的需求Ⅲ．设计和实现数据库并按需要修改和转换数据Ⅳ．为用户提供资料和培训方面的帮助A.Ⅰ和ⅡB.Ⅱ和ⅢC.Ⅰ和ⅣD.都是

单项选择题麻醉前与患者沟通的主要目的是A. 做详细的体格检查B. 了解患者是否禁食C. 了解患者是否对某些药物过敏D. 了解患者的基本情况并缓解其紧张情绪E. 了解患者对手术和麻醉的意见

未分类题The term 'declined' in the last sentence of the second paragraph most probably denotes ______.A.refusedB.droppedC.divedD.compromised

判断题编制质量指标指数需固定质量指标因素,只观察数量指标因素和综合变动。

未分类题Which of the followings can be attributed to Dr. Connolly's study?A.Pay discrimination between male and female scientists.B.Fewer resources for research by women scientists.C.The super qualities possessed by male scientists.D.The role of analyzing the results of a survey.

未分类题In contrast to Dr. Connolly's study, the previous ones failed to ______.A.make a comparison between the experience of scientists in others kinds of laboratory and that of those in universitiesB.make themselves more eligible for promotionC.make a difference for a woman to settle into a professorial chairD.make the supposedly egalitarian world of academia deliver more equality

多项选择题按CFRExShip'sHold成交,采用航次租船,租船时通常应按( )条件订立租船合同。

单项选择题‌根据《UCP500》，信用证的第一付款人是‏

未分类题Abiomed's heart distinguishes itself from Jarvik's in that ______.A.the latter does not need connecting tubes outside the body of a patientB.the former needs tubes or wires coming out Of patientsC.the latter allows patients to go home and even turn around in bedD.the former sets patients free due to the fact that there are no tubes or wires coming out of the patients