这个秒表和电子计时触板一共多少钱? ?。
How much are the stopwatch and the elcctronic timing pad altogether?
该文介绍了一种自制的细胞电泳电子计时装里。
An electronic apparatus for measuring cell electrophoretic migration time is described.
1912年斯德哥尔摩奥运会上,电子计时设备和公共报道系统第一次在奥运会上使用。
In 1912 in Stockholm, the first electric timing devices and public address system was used at the Olympics.
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