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【单选题】
以下表述不正确的是:( )
A.
对用户级线程来讲，内核也并不知道它的存在，所以所有对用户级线程的管理和调度都 是在用户空间来进行的
B.
用户级线程的切换需要通过中断进入操作系统的内核
C.
如果内核是单线程的，那么任何一个用户级线执行了阻塞系统调用就会导致该线程 所属的进程阻塞
D.
如果采用的是内核级线程，当一个线程被阻塞，该进程中的线程不会被阻塞。
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