从供选择的答案中选出应填入英语文句中()的正确的答案。

PCs originated as stand-alone (A), however, in recent years many have been (B) to Local Area Networks (LANs). In a LAN, the data and usually the user application reside on the File Server, a PC running a special Network Operating System (NOS) such as Novell's NetWare or Microsoft's LAN Manager. The File Server manages the LAN users' shared access to data on its hard (C) and frequently provides access to other shared resources, such as printers. While a LAN enables users of PC-based databases to share (D) data files, it doesn't significantly change how the DBMS works; all the actual data (E) is still performed on the PC running the database application.

A．～E: ① calculating ② common ③ connected ④ disks

⑤ displayed ⑥ systems ⑦ primers ⑧ processing

⑨ some ⑩ workstations

[单选题]从供选择的答案中选出应填入英语文句中()的正确的答案。A．pplications put computers to practical business (A), but below the (B) it's the heart of an operating system the kernel that provides the technical wizardry to juggle multiple program, connect to networks and store (C) .

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[单选题]从供选择的答案中选出应填入英语文句中()的正确的答案。Software products may be (A) into four basic types: application programs, programming language processors, operating systems, and system utilities.A．pplication programs are programs that (B) useful tasks such as solving sta

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[单选题]从供选择的答案中选出应填入下列叙述中( )内的D．BMS是位于(A) 之间的一层数据管理软件。关系数据库的概念模型式是(B) 的集合。关系数据库的数据及更新操作必须遵循(C) 等完整性规则。用符号.|X|表示的关系操作称为(D) 操作。没有关系R和S如下：供选择的答案A．：①OA软件与用户 ②OS与DB ③硬件与软件 ④OS与硬件B．：①关系模型 ②关系模式 ③关系子模式 ④存储模式C．：①实体完整性和参照完整性②参照完整性和用户定义的完整性③实体完整性和用户定义的完整性④实体完整性、参照完整性

[单选题]从供选择的答案中选出应填入下列叙述中()内的树是结点的集合，它有(A)个根结点。二叉树有(B)个根结点，按一定的规则，任一树都可以转换成惟一对应的二叉树。二叉树的查找有深度优先和广度优先两类，深度优先包括(C)。当一棵二叉树的前序序列和中序序列分别是HGEDBFCA和EGBDHFAC时，其后序序列必是(D)，层次序列为(E)．供选择的答案A．：①且只有1 ②1或多于1③0或1 ④至少2B．：①且只有1 ②1或多于1③0或1 ④至少2C．：①前序遍历后序遍历中序遍历②前序遍历后序遍历层次遍历③前序