http://teerm.nasa.gov/LeadFreeSolderTestingForHighReliability_Proj1.htm
我想
1.NASA需要更多时间和数据,比如在空间状况下数据积累很难
2.他的供应商慢一些,因为他没有什么量
http://teerm.nasa.gov/LeadFreeSolderTestingForHighReliability_Proj1.htm
我想
1.NASA需要更多时间和数据,比如在空间状况下数据积累很难
2.他的供应商慢一些,因为他没有什么量
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