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下列Verilog HDL程序所描述电路功能是（ ） module Dataflow( A, En, Y); input [2:0] A; //输入端口声明 input En; //输入端口声明 output [7:0]Y; //输出端口声明 assign Y[0] = ~( En & ~A[2] & ~A[1] & ~A[0] ); assign Y[1] = ~( En & ~A[2] & ~A[1] & A[0] ); assign Y[2] = ~( En & ~A[2] & A[1] & ~A[0] ); assign Y[3] = ~( En & ~A[2] & A[1] & A[0] ); assign Y[4] = ~( En & A[2] & ~A[1] & ~A[0] ); assign Y[5] = ~( En & A[2] & ~A[1] & A[0] ); assign Y[6] = ~( En & A[2] & A[1] & ~A[0] ); assign Y[7] = ~( En & A[2] & A[1] & A[0] ); endmodule
A、8/3线编码器
B、3/8线译码器
C、加法器
D、数据选择器
A、households spend all of their income.
B、all goods and services are bought by households.
C、expenditures flow through the markets for goods and services, while income flows through the markets for the factors of production.
D、All of the above are correct.
RTU阀室用电负荷很小（537W），供电质量和负荷等级高，且均处于偏远地区，外电源供电质量和供电可靠性难以满足负荷供电要求时，须选用可靠的自备电源：太阳能电源或小容量天然气发电装置（均带有不同容量的蓄电池）等供电设备，以确保其不间断供电的要求。RTU valve chamber electricity load is small (537 w), high quality of power supply and load grade, and are in remote areas, the quality of power supply and power supply reliability meets the requirement of load power supply, should choose reliable energent power: solar power or small capacity of gas power generation device (all with different capacity of battery) and other power supply equipment, to ensure the uninterrupted power supply requirements.
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