报警控制的功能有()
A.向探测器发出指令
B.发出声光报警
C.探测入侵信号
D.实现信号传输
E.接收由信道传输来的危险信%
参考答案:A, B, E
后直开领加深,后总肩放宽,后小肩加长,后肩斜度改小是对()弊病的修正方法。
A、领离脖
B、荡领
C、后领口起涌
D、爬领
(68) refers to the parts of the computer that you can ,see and touch. It is used for the purpose of (69) .
A.input
B.output
C.central processing
D.all of the above