如果认为CPU等待设备的状态信号是处于非工作状态(即踏步等待),那么,在下面几种主机与设备数据传送方式中, (1) 主机与设备是串行工作的, (2) 主机与设备是并行工作的, (3) 主程序与外围设备是并行运行的。

A、<span style=""FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-bidi-font-family: "" times="""" new="""" roman"";="""" mso-font-kerning:="""" 1.0pt;="""" mso-ansi-language:="""" en-us;="""" mso-fareast-language:="""" zh-cn;="""" mso-bidi-language:="""" ar-sa""="""">程序查询方式</span>

B、<span style=""FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-bidi-font-family: "" times="""" new="""" roman"";="""" mso-font-kerning:="""" 1.0pt;="""" mso-ansi-language:="""" en-us;="""" mso-fareast-language:="""" zh-cn;="""" mso-bidi-language:="""" ar-sa""="""">中断方式</span>

C、<span lang=""EN-US"" style=""FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-bidi-font-family: "" times="""" new="""" roman"";="""" mso-font-kerning:="""" 1.0pt;="""" mso-ansi-language:="""" en-us;="""" mso-fareast-language:="""" zh-cn;="""" mso-bidi-language:="""" ar-sa""="""">DMA</span><span style=""FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-bidi-font-family: "" times="""" new="""" roman"";="""" mso-font-kerning:="""" 1.0p"