简述质量检验阶段的优点。_爱下问搜题

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问题问答题简答题

简述质量检验阶段的优点。

答案

参考答案：

不合格产品通向市场之路被切断。

完形填空

完形填空。

Dear Mary:
     I'm so  1 to hear from you. In the letter you say that your school is very  2 and you like your classroom.
That's great! I  3 my classroom, too,  4 mine is very quiet and I can finish my work quickly. My best friend is
Jack.He is a fun boy and we always have a good time. I like playing tennis, and he  5 to play basketball,  6 we
both like to play baseball, so we always play baseball  7 class. In your letter you say Chinese is your favorite
lesson, but I don't know any words.  8 Time you write,can you tell me some Chinese words? I go to the
computer club every Friday evening. I think it helps me  9 my study. I hope I can  10 you soon.

( )1. A. sad
( )2. A. small
( )3. A. hate
( )4. A. so
( )5. A. like
( )6. A. and
( )7. A. before
( )8. A. Last
( )9. A. for
( )10. A. watch

B. hungry
B. big
B. see
B. but
B. likes
B. or
B. between
B. Next
B. to
B. look

C. happy
C. middle
C. like
C. because
C. enjoy
C. but
C. after
C. This
C. at
C. look at

D. helpful
D. dirty
D. visit
D. why
D. prefer
D. so
D. in
D. That
D. with
D. see

单项选择题

在一个单CPU的计算机系统中，有三台不同的外部设备R1、R2、R3和三个进程P1、P2、P3。系统CPU调度采用可剥夺式优先级的进程调度方案，三个进程的优先级、使用设备的先后顺序和占用设备时间如表2-5所示。

表2-5 进程占用设备情况
进程	优先级	使用设备、GPU的先后顺序和占用时间
P1	高	R1(20ms)→CPU(20ms)→R3(20ms)

P2	中	R3(40ms)→CPU(30ms)→R2(20ms)
P3	低	CPU(30ms)→R2(20ms)→CPU(20ms)

假设操作系统的开销忽略不计，从三个进程同时投入运行到全部完成，CPU的利用率约为 (30) %；R3的利用率约为 (31) %(设备的利用率指该设备的使用时间与进程组全部完成所占用时间的比率)。

A．66.7

B．75

C．83.3

D．91.7