The construct     Cobegin        Statement1;        Statement2;     Coend  means Statement1 and Statement2 are to be executed in

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问题 The construct     Cobegin        Statement1;        Statement2;     Coend  means Statement1 and Statement2 are to be executed in parallel.The only two atomic actions in this construct are loading the value of a variable and storing into a variable.For the program segment    x:=0;    y:=0;    cobegin     begin        x:=1;        y:=y+x;     end;     begin        y:=2;        x:=x+3;     end    coend  Which of the following indicate(s) possible values for the variables when the segment finishes execution?  
Ⅰ.x=1,y=2  
Ⅱ.x=1,y=3  
Ⅲ.x=4,y=6

选项 A、Ⅰ
B、Ⅱ and Ⅲ
C、Ⅰ and Ⅲ
D、Ⅱ and Ⅲ

答案D

解析
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