为了测量空间材料二次电子发射特性，航天科研机构已进行了相关的研究，研制出了几代测试装置。
To measure secondary electron emission characteristics of space materials, space research institutions have done some research and developed several generations of test system.
为了测量空间材料二次电子发射特性，航天科研机构已进行了相关的研究，研制出了几代测试装置。
To measure secondary electron emission characteristics of space materials, space research institutions have done some research and developed several generations of test system.
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