To reach the qualification of outer space ultraviolet irradiation, we adopted the diffuse pump and mechanic pump as the high vacuumizing unit.
采用扩散泵和机械泵作高真空抽气系统组成模拟系统，以达到地外紫外线辐照条件。
Adopting piston pump with fixed stroke, the piston directly propels the diaphragm, thus deleting the complex mechanic stroke adjustment equipment.
采用固定冲程的柱塞泵，省去复杂的机械冲程调节装置，使柱塞直接推动膜片工作。
He employs a petrol pump attendant and a mechanic.
他雇佣了一个油泵服务员和一个机修工。
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