假设系统中有n个进程共享3台打印机，任一进程在任一时刻最多只能使用1台打印机。若用P

发布时间：2017-07-19 04:06 │ 来源：www.tikuol.com

题型：单项选择题

问题：

假设系统中有n个进程共享3台打印机，任一进程在任一时刻最多只能使用1台打印机。若用PV操作控制n个进程使用打印机，则相应信号量S的取值范围为（）；若信号量S的值为-3，则系统中有（）个进程等待使用打印机。

假设系统中有n个进程共享3台打印机，任一进程在任一时刻最多只能使用1台打印机。若用PV操作控制n个进程使用打印机，则相应信号量S的取值范围为（）；

A．0，-1，…，-(n-1)

B．3，2，1，0，-1，…，-(n-3)

C．1，0，-1，…，-(n-1)

D．2，1，0，-1，…，-(n-2)

考点：计算机软件水平考试高级系统架构设计师计算机水平考试高级系统架构设计师2012年下半年上午真题

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完形填空。

     The generation gap(代沟) has become a serious problem. I read a   l     about it in the newspaper.
Some children have killed themselves after   2     with parents. I think this is because they  seldom(极少地)  have a talk with each other.  Parents now   3   more time in the office,   4      they don't have much
time to stay with their children.  As time passes, they both feel that they don't h ave the   5    topic to talk
about. I want to tell parents to spend more time with your   6    , get to know them and .   7    them.
And for children, show your   8   to your parents. They are the people who love you. So   9      them
your thoughts. In this way, you       10   understand each other better.

( )1. A. message
( )2. A. talking
( )3. A. spend
( )4. A. because
( )5. A. interesting
( )6. A. business
( )7. A. like
( )8. A. interest
( )9. A. tell
( )10.A. can

B. call
B. arguing
B. stay
B. if
B. same
B. children
B. look after
B. secret
B. ask
B. should

C. report
C. fighting
C. work
C. but
C. true
C. work
C. understand
C. trouble
C. answer
C. must

D. letter
D. playing
D. have
D. so
D. good
D. office
D. love
D. feelings
D. say
D. will

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