What is the difference between a CSU/DSU and a modem?（） A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased line.。 A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased line.。 A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone line.。 A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line.。
课程与教学评价的功能有：导向功能、诊断功能、（）功能、（）功能和发展功能。
用于与玻璃瓶口相配的的塑料盖上的螺纹，应选用（）。 60°标准螺纹。 梯型螺纹。 锯齿形螺纹。 圆弧形螺纹。
提香的艺术特点？
Which two statements about VPNv4 address are true？ （） The VPNv4 address is 128 bits long with a 128-bit long subnet mask。 The VPNv4 address consists of an RD and an IPv4 address。 The VPNv4 address is 96 bits long with a 64-bit long subnet mask。 The VPNv4 address is 128 bits long with a 64-bit long subnet mask。 The VPNv4 address consists of an RT and an IPv4 address。 The VPNv4 address is 96 bits long with a 32-bit long subnet mask。
目前通常根据工程、系统生命周期和评价的目的，国内将安全评价分为四类。下面属于这四类的有（）。
