(单选题)1: Which of the following is not the advantage of email? A: fast B: more expensive C: sent easily D: 24-hour service ...
(判断题)15: When giving a presentation, try to make eye contact with everyone you are speaking to if possible. A: 对 B: 错 ...
(单选题)9: A notice ususlly covers following elements except ________. A: time B: people C: location D: signature ...
(单选题)3: Which of the following is not the features of posters? A: readable B: illegible C: concise D: well-organized ...
(判断题)11: 全双工通信方式只能沿单一方向发送或接收数据。 A: 对 B: 错 ...
(单选题)5: 西门子通信网络的中间层为( )。 A: 工业以太网 B: PROFIBUS C: AS-i D: EIB ...
(判断题)13: S7-200在任何时刻,只能执行一个中断程序。 A: 对 B: 错 ...
(单选题)1: ( )指令全局性地禁止处理所有中断事件。 A: ENI B: DISI C: ATCH D: DTCH ...
(判断题)15: 梯形图由触点、线圈和用方框表示的功能块组成。 A: 对 B: 错 ...
(单选题)3: PLC可以向扩展模块提供()直流电源。 A: 5V B: 12V C: 24V D: 36V ...