Once a clinician determines that a patient has many risk factors, bone mineral densitytesting should be performed.
一旦医生确定病人有许多危险因素，骨密度测试应该进行。
2
This paper introduces the work principle of gas densitytesting system based on SCM AT89C51, and gives the hardware structure and software flow of testing system.
本文介绍了基于AT 89 C 51单片机气体浓度测试仪的工作原理，给出了测试仪的硬件结构及软件流程。
3
The principle, structure of the NBT-1 model of density adjusting unit were introduced. It can form a complete set with the densitytesting meter to control the density of the paper pulp.