principal focus
4.The component selection,series explosive prescription,manufacture technol-ogy and principal properties are described for BSE series cryo-resistant seismic focus emulsion explosive columns,with discussions on the operation techniqueand the results obtained. The effect of these explosives on the development ofCMna’s seismic prospecting techniques is also predicted。
7.As for the question of what is the principal contradiction in the current period -- what is the main issue or central task confronting the Party and the people in the current period -- actually this question was answered by the decision of the Third Plenary Session of the Eleventh Central Committee to shift the focus of our work to socialist modernization.
