Eletronic book is becoming a new choice for reading for more and more youngsters.

电子书成为越来越多年青人念书体例的新选择。

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Design and make a set of computer time scale experiment system on 82B Lab desk, include four phase time eletronic level and two phase working pulse.

在8 2 B型计算机实验台设计制作出一套计算机时标实验系统，包括四相节拍电平及两相工作脉冲，利用此时标系统可组合出计算机所需要的各种时序信。

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