【判断题】西门子S7-200PLC端子分为输入端子和输出端子。
【单选题】——How long have you worked here? ——__________________.
【简答题】PLC 按结构分两类即 如西门子的S7-200系列和 如西门子的S7-300,S7-400。
【单选题】西门子S7 200系统故障灯亮的原因是()。
【简答题】He founded the company five years ago and has been managing the business ______.
【单选题】What is the meaning of “five score years ago”?
【单选题】西门子S7 200系统电源损坏的原因是()。
【简答题】--When _______ you _______ to learn to skate? --Five years ago.
【单选题】Five years ago her brother was university studentof physics .