在大风浪中航行，船舶所受的总阻力发生了变化，主要表现在（）。a．空气阻力增加；b．船

建国初期前三年中进行的运动主要有（）。

A.土地改革运动

B. * * 反革命运动

C.“三反”“五反”运动

D.抗美援朝运动

北宋着名的政治家和文学家，被列宁称为“中国十一世纪的改革家”的是谁？

请你标示出下图的各部分零件名称。

Basically, a firewall is a (145) process or a set of integrated processes that runs on a router or (146) to control the flow of networked application traffic (147) through it. Typically, firewalls are placed on the entry point to a (148) network such as the Internet. They could be considered traffic cops. The firewall’s (149) is to ensure that all communication between an organization’s network and the Internet conform to the organization’s policies.

A．local

B．national

C．private

D．public

摩擦式带传动机构有过载保护功能，主要表现为过载时传动皮带打滑。