It was the first time for the two to assemble the suits in zero-gravity as it is impossible to create a real zero-gravity condition on Earth.
这是首次是两个在飞行时的失重状态装配宇航服，在地球上创造一个真正的失重状态是不可能的。
Ways to improve the reliability of arc welding inverter power and the research condition of zero voltage, zero current soft switch inverter are introduced.
介绍提高我国弧焊逆变电源可靠性的途径以及零电压、零电流软开关变换研究现状。
The applications under the zero or non-zero lead time of the manufacturer condition and the batches delivery condition are considered.
在模型中，分别考虑了制造商提前期为零和不为零，以及可分批交货等不同情形下的应用情况。
The applications under the zero or non-zero lead time of the manufacturer condition and the batches delivery condition are considered.
在模型中，分别考虑了制造商提前期为零和不为零，以及可分批交货等不同情形下的应用情况。
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