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现有一分六多路数据分配器VHDL程序如下，请在空格中填入对应内容，实现预期功能。空格排序为从上到下，从左到右依次增大。LIBRARY________;USE IEEE.STD_LOGIC_1164.ALL;USE IEEE.STD_LOGIC_UNSIGNED.ALL;ENTITY DEMUX1_6ISPORT(DIN : in STD_LOGIC;S : in STD_LOGIC_vector (downto );DOUT : out STD_LOGIC_vector(downto ));END;ARCHITECTURE BEHAVE OF DEMUX1_6 ISBEGINPROCESS(S,DIN)BEGINCASE S ISWHEN "000"=>DOUT(0)<=DIN;WHEN "001"=>DOUT(1)<=DIN;WHEN "010"=>DOUT(2)<=DIN;WHEN "___"=>DOUT(3)<=DIN;WHEN "_"=>DOUT(4)<=DIN;WHEN "_"=>DOUT(5)<=DIN;WHEN OTHERS=>;END CASE;end ____;end behave;

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现有四选一多路数据选择器的VHDL程序如下，请在空格中填入对应内容，实现预期功能。（空格排序为从上到下，从左到右依次增大）LIBRARY IEEE;USE IEEE.STD_LOGIC_1164.ALL;USE IEEE.STD_LOGIC_UNSIGNED.ALL;ENTITY MUX4_1 ISPORT( DIN: in STD_LOGIC_vector( downto _);S: in STD_LOGIC_vector(___ downto );DOUT: _ STD_LOGIC);END;ARCHITECTURE BEHAVE OF ISBEGINPROCESS(S,DIN)BEGINCASE S ISWHEN "00"=>DOUT<=DIN(0);WHEN "01"=>DOUT<=DIN(1);WHEN ""=>DOUT<=DIN(2);WHEN ""=>DOUT<=DIN(3);WHEN =>NULL;END ____;end process;end behave;

After reading the following list, you are required to find the item equivalent to (与……等同) those given in Chinese in the table below.Example：( G)游览路线 ( H)物品存放处

下列属于垂直传播方式的是：

A. 经消化道感染
B. 经呼吸道感染
C. 经胎盘感染
D. 经动物叮咬传播

经用电镜才能观察其形态的是：

A. 细菌
B. 病毒
C. 支原体
D. 螺旋体