晶体计数器

The system is made up by silicon crystal oscillator,frequency divider,number counter,decipherer,LED indicator and calibrated circuit and utilizes the medium-sized and small-sized integrated chip.

本系统由石英晶体振荡器、分频器、计数器、译码器、LED显示器和校分电路组成，采用了中小规模集成芯片。

This design uses quartz crystal oscillator, dividers, counters, displays and school circuit.

本设计采用石英晶体振荡器、分频器、计数器、显示器和校时电路组成。

The main circuit carries on the basic function of the digital electronic calculagraph and the expanded circuit carries on the expanded function of it.

论文 字数：5050 页数：16）摘要：本系统由石英晶体振荡器、分频器、计数器、译码器、LED显示器和校分电路组成，采用了中小规模集成芯片。

Liquid scintillation counter ; Detection efficiency ; Background ; Anticoidence shield ; Crosstalk count ; Nal crystal

液体闪烁计数器；探测效率；本底；反符合屏蔽；串光计数； NaI晶体

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。