(单选题)19: 假设变量初值为:a=2,b=4,则以下程序执行后,a和b的值分别为architecture rtl of example is
begin
process
variable a ,b:std_logic;
begin
a := b;
b := a;
end process;
end rtl;
A: 2,2
B: 2,4
C: 4,2
D: 4,4
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