【多选题】进行电容式接近开关调试时,让被检测物体在其测量范围内,观察后端LED状态显示灯是否会亮。当有工件靠近时,其状态指示灯应 ,信号输出“ ";如果其状态指示灯 ,有可能是 或 ,需要将其接线重新连接正确;也有可能是其检测 太低,可 提高检测灵敏度,直到LED状态指示灯稳定显示为止。同样类似于漫反射式光电接近开关的调试,电容式接近开关的检测 也不能太高,以防止其对周围环境过于 而产生错误检测信号。
【单选题】It was a fine day once the mist had .
【单选题】投资人以资本金形式向项目或企业投人的资金称为( )。
【单选题】She said she was glad the difficulty had been _____.
【判断题】mRNA是转运核糖核酸,tRNA是信使核糖核酸。
【判断题】如果竞争对手采用了差异性营销战略,本企业可采用无差异性市场营销战略。
【判断题】实施共同配送是解决物流最后一公里的方法之一。
【判断题】The freight on behalf of the importer, has the right to deliver the cleared goods to the consignee.( )
【判断题】In radio communication, "cleared" and "approved" are interchangeable. "Cleared" in “cleared as filed”, “cleared for takeoff”, “cleared to land” can be replaced by “approved”.
【简答题】张华把3000元钱存入银行,定期2年,年利率为2.10 ,到期时他一共能取回( )元钱?