[单选]智商主要反映的是人的（）的能力。
A．感性
B．理性
C．感情
D．思维
User programs interact with the kernel through a set of standard(71). They request services to be provided by the kernel. Such services would include accessing a file: open close, read, write, link, or execute a file; starting or(72)accounting records; changing ownership of a file or(73); changing to a new directory; creating,(74), or killing a process; enabling access to hardware devices; and setting limits on system resources. Unix is a multi -user, multi -tasking operating system. You can have many users logged into a system simultaneously, each running many programs. It's the kernel's job to keep each process and user separate and to regulate access to(75), including cpu, memory, disk and other L/O devices.
A．system commands
B．system transfer
C．system calls
D．system rings
一座办公大楼内的计算机网络系统可看作(27)。
A．LAN
B．MAN
C．NAN
D．WAN
A．ΠA(R)×ΠD(S)
B．R∪S
C．ΠC(R)∩ΠC(S)
D．R｜＞＜｜S
A．考虑无风险报酬率
B．高于行业基准收益率
C．低于投资机会成本
D．高于投资机会成本
A．源端
B．核心交换机
C．路由器
D．目标端