搜题请搜索小程序“爱下问搜题”
问题 多项选择题

电网调度基本任务有（）。

A.合理使用发、输、变电设备能力，保证负荷用电需求

B.消除运行隐患、处置异常故障，保证电网安全运行和连续供电

C.协调发、输、变、配、用等各环节运行，保证供电质量

D.组织、指挥、协调电网生产运行

答案

参考答案：A, B, C, D

单项选择题

中性粒细胞或巨噬细胞的杀菌作用，主要是由下列各项中哪项完成的：

A．磷脂酶

B．各种水解酶

C．溶菌酶

D．杀菌素

E．H2O2-MPO-Cl-系统
查看答案
单项选择题

Networks can be interconnected by different devices. In the physical layer networks can be connected by (31) or hubs, which just move the bits from one network to an identical network. One layer up we find bridges and switches which operate at data link layer. They can accept (32) , examine the MAC address and forward the frames to a different network while doing minor protocol translation in the process. In network layer, we have routers that can connect two networks. If two networks have (33) network layer, the muter may be able to translate between the packer formats. In the transport layer we find transport gateway, which can interface between two transport connections. Finally, in the application layer, application gateways translate message (34) . As an example, gateways between Internet e-mail and X.400 e-mail must (35) the e-mail message and change various header fields.

（35）是（）

A.analyze

B.parse

C.delete

D.create
查看答案