The radiation shielding efficiency of material depends upon photon attenuation, exposure buildup factors and neutron removal capacity. A newly developed Pb-free
Wellblock Fan 116 is located in northern Boxing subsag of Dongying Sag,Jiyang Depression.The structural feature of sandbody in the second sand group of the midd
The growth rate of China’s oil demand dropped considerably in the first half of 2013,and that of oil products demand varied a lot.The growth rate of domestic c