在真空环境下，用氩为推进剂，得到了不同工况下发动机的性能参数。
In vacuum environment, the performances of the arcjet were tested under several conditions with argon as the propellent.
通过该装置实现了对超声电机负载力矩的施加以及在真空环境下对超声电机转速、转矩的测量。
With the testing system, the mechanical load is applied and the relationship between the mechanical load and the revolution speed of the ultrasonic motor is studied under the vacuum condition.
二是使用了一个在样品室非真空环境下仍然能起作用的二次电子探头。
The second is using a secondary electron detector that could function in this non vacuum sample environment.
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