CK-2型通讯控制系统由控制、通讯、传输三部分组成。（）
参考答案：错
开发商进行房地产开发投资，是其积累固定资产的重要方式。 ( )
Computer systems consist of two very different types of elements: Hardware, which includes all the physical things that can be touched and ______, which tells the hardware how to do.
A．Operating system
B．I/O devices
C．Courseware
D．Software
