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【单选题】
有两个并发进程P1,P2 , 其程序代码如下: P1() { x=1; y=2; z=x+y; print z; } P2() { x=-3; c=x*x; print c; } 打印出z的值有( )可能打印出的c值有( )(其中x为Pl.P2的共享变量)。A.
z=1，-3；c=-l，9
B.
z=-1，3；c=1，9
C.
z=-1，3；1，c=9
D.
z=3；c=1，9
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