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【单选题】
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
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【多选题】投资方在对被投资单位的净利润进行调整时,下列表述正确的有( )。
A.
应考虑重要性原则，不重要的项目可不予调整
B.
出于严谨性考虑，联营企业合营企业内部发生事项不管是否具有重要性，都要进行调整
C.
投资企业无法合理确定取得投资时被投资单位各项可辨认资产、负债等公允价值的，或投资时被投资单位可辨认资产、负债的公允价值与账面价值之间的差额不具有重要性的，不需要调整净利润，直接按被投资单位的账面净利润计算相应份额
D.
其他原因导致无法取得对被投资单位净利润进行调整所需资料的，也不需调整，按账面净利润计算相应份额
【简答题】交流接触器的电磁系统主要由 、 、 组成。