To improve the measurement accuracy of the radionuclide activity by verified the medical activitymeter of user in order to reduce unnecessary exposure.
目的：通过对医用活度计的检验，改善放射性核素活度的测量准确性，减少不必要的照射。
2
We come here today for the opening ceremony of a 300-square-meteractivity center.
我们今天来这个仅为300平方米的活动中心参加开幕仪式。
3
The key indicators for evaluating the benefit of explorational activity should include 2-D seismic cost per kilometer, 3-D seismic cost per square kilometer, and drilling cost per meter in depth.