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【单选题】
在对互斥资源(信号量)进行P、V操作中，P操作是(18)，而V操作是(19)。假如有3个进程(p1，p2，p3)都需要共享资源(m，个数为2)。则p1申请该资源时，执行操作：(20)。P1运行需对该资源进行的操作是(21)。假如P1，P2已经占用资源m，则p3开始运行后的状态可能为：(22)。A.
使用一个资源
B.
分配一个资源
C.
释放一个资源
D.
共享一个资源
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反馈参考答案：
举一反三
【单选题】院前急救中，早期电除颤要求在下列哪项时限内完成（）
A.
患者发病后5分钟内
B.
目击者发现患者5分钟内
C.
急救医师到达现场5分钟内
D.
接到求救后5分钟内
E.
急救医师到达现场10分钟内
【单选题】Seventy percent of the students _____ taken part in the work and seventy percent of the work _____been finished. [ ]
A.
has, has
B.
had , had
C.
has, have
D.
have, has
【单选题】Which of the following is NOT true?
A.
Seventy million people have an eating disorder in the world．
B.
More than 1／2 0f the women and 2／3 0f the men in Britain have weight problem．
C.
More than 1／4 0f adults and 1／5 0f children in USA weigh too much．
D.
Clothing factories and magazines showed images of women of all shape．
【单选题】听力原文：M: You must have been driving at seventy miles an hour. Didn' t you see the speed limit? W: I can' t have been driving that fast. M: I was doing eighty when I overtook you. What were they talking...
A.
The driving speed of the woman.
B.
How fast they should drive.
C.
The speed limit.
D.
The driving speed of the man.
【单选题】配合回归直线方程对资料的要求是( )
A.
因变量是给定的数值,自变量是随机的
B.
自变量和因变量都是随机的
C.
自变量是给定的数值,因变量是随机的
D.
自变量和因变量都不是随机的
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