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【多选题】
下面关于S7-200系列PLC的脉冲输出指令的叙述中对的是: ( )A.
EU是上升沿微分输出指令
B.
ED是下降沿微分输出指令
C.
EU指令使操作软元件在输入信号上升沿时产生一个可调周期的脉冲输出
D.
ED指令则使操作软元件在输入信号下降沿产生一个可调周期的脉冲输出
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【简答题】plc 软件系统有( ) 和( )两大部份
【简答题】plc 软件系统有 和 两大部分
【简答题】物料衡算基准有 、 以及 为衡算基准。
【简答题】PLC软件系统有( )和( ) 两大部分
【判断题】他知道那项任务很难,但还是接受了。 He was conscious of the difficulty of the task, but he still accepted it.
A.
正确
B.
错误
【单选题】他知道那项任务很难,但还是接受了。
A.
He was conscious of the difficulty of the task, but he still accepted it.
B.
He was conscious that the difficulty of the task, but he still accepted it.
C.
He was conscious of the difficult of the task, but he still accepted it.
D.
He was conscious of the difficulty of the task, but he still refused it.
【简答题】plc 软件系统有 系统程序 和 两大部分。
【判断题】He was conscious of the difficulty of the task, but he still accepted it. 正确翻译为:他知道那项任务很难,但还是接受了。
A.
正确
B.
错误
【简答题】PLC 软件系统有 和 两大部分。
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