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dui ji xie bao shi zhong de yi dian gai jin
Pages: 99
Year: Issue:  S2
Journal: Journal of Lingling Teachers College

Abstract: 我校于一九八三年先后买回两台机械自动报时钟,用机械自动报时钟来代替人工打铃确实感到有许多益处。但是在使用过程中,我发现这类机械自动报时钟有如下缺点,便分别对它进行了适当的改进,使用了四五年,收效比较明显。
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