20. 若a=1,b=2,下面程序执行后,a和b的值分别为 。 architecture rtl of entityName is signal a, b: integer; begin process (a, b) variable c: integer; begin a <=b ; c := a ; b <= c ; end process; end rtl ;
A. 1,2
B. 2,1
C. 1,1
D. 2, 2
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