The oil-line structure, control system and their working principles of the hydraulic lifting system for the main magnets of CYCIAE-30 cyclotron are introduced.
In fact, in line with past experience, capital expenditure in the oil sector has dropped sharply in many producing countries, including the United States.
事实上，根据过去的经验，包括美国在内的许多石油生产国的石油部门的资本支出已经急剧下降了。
3
The general situation of domestic oilline pumps is presented, the hydraulic design formulas and performance curves of the multistage impeller pumps are given.