进程P1、P2、P3、P4、P5和P6的前趋图如下所示：
若用PV操作控制这6个进程的同步与互斥的程序如下，那么程序中的空①和空②处应分别为（ ）；空③和空④处应分别为（ ）；空⑤和空⑥处应分别为（ ）。
问题1选项
A.V（S1）和P（S2）
B.P（S1）和V（S2）
C.V（S1）和V（S2）
D.V（S2）和P（S1）
问题2选项
A.V（S3）和V（S5）
B.P（S3）和V（S5）
C.V（S3）和P（S5）
D.P（S3）和P（S5）
问题3选项
A.P（S6）和P（S5）V（S6）
B.V（S5）和V（S5）V（S6）
C.V（S6）和P（S5）P（S6）
D.P（S6）和P（S5）P（S6）
正确答案及解析
正确答案
解析
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