有三个关系R、S和T如下：
则由关系R和S得到关系T的操作是（　　）。

[单选题]You are the network administrator for your company. The network consists of a single Active Directory domain. All servers run Windows Server 2003. All company data is stored in shared folders on network file servers. The data for each department is stored in a departmental shared folder. Users in each department are members of the departmental global group. Each departmental global group is assigned the Allow - Full Control permission for the corresponding departmental shared folder. Company requirements state that all access to shared folders must be configured by using global groups. A user named Richard works in the sales department. Richard needs to be able to modify files in the Marketing shared folder. You need to ensure that Richard has the minimum permissions for the Marketing shared folder that he needs to do his job. You need to achieve this goal while meeting company requirements and without granting unnecessary permissions. What should you do? （）

[判断题]我国领队在出境旅游团队中既是服务人员，也是团队的领导，具有不可替代的地位

[单选题]发电企业通过实施本质安全管理能够取得以下预期效果：“人员”本质安全度持续提升，人员的安全知识、（）、安全意识水平显著提高，违章行为日益减少、直至杜绝。

[单选题]作用持久，每天只需用药一次的降压药是（）

[判断题]制冷压缩机应先开机，后开水阀（水冷式冷凝器）或风机（风冷式冷凝器）。（）

[判断题]内在的需要是促使人产生某种动机的根本原因。

[单选题]摩洛哥采取的政体形式是（）

[单选题]手足口病主要传播途径是（）。

[单选题]光学经纬仪竖轴固定在望远镜横轴一端，随望远镜一起在（）内转动。

[单选题]锁骨骨折多发生于锁骨（　　）。