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【单选题】
为保证进入某SCR段中各动作的顺利执行且符合梯形图的编程特点(即左母线与线圈之间一定要有触点),一般采用下列哪个特殊存储器位作为与左母线连接的触点。( )A.
SM0.4
B.
SM0.1
C.
SM0.0
D.
SM0.5
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【单选题】After supper she would sit down by the fire，sometimes for _____ an hour，thinking of her young and happy days．
A.
as long as
B.
as soon as
C.
as much as
D.
as many as
【简答题】阅读理解。 Once there was an old man in a town.He always forgot a lot of things.So his wife always had to say to him, 'Don't forget this!' One day he went on a long trip alone.Before he left home,his wife ...
【简答题】教育技术学研究的作用
【简答题】Many of his finest pictures are________ （悬挂）in the National museum.
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