10. 下例程序执行后,X和Y的值分别为 。process(A,B,C) variable D : std_logic; begin D := A; X <= B+D; D := C; Y <= B+D; end process;
A. B+C和B+A
B. B+A和B+C
C. B+C和B+C
D. B+A和B+A
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