PLC为适应不同负载的控制要求,采用不同的输出接口方式,其中高速、大功率的交流负载,应选用( ) 输出接口电路
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系统存储器又称为( ),用来存放系统管理和监控程序以及对用户程序作编译处理的程序,由厂家固定,用户不能修改。
A. RAM
B. ROM
CPU
D. UPS
输出指令=,不能用于( )的输出
A. M
B. S
C. I
D. Q
Choose the best item to complete each of the following sentences.1.The house caught fire and two men were burned__________.
A. live
B. living
C. lived
D. alive
Their religion is based on a respect for all__________ things.
A. live
B. living
C. lived
D. alive