共 50 条
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- [35] THE 50-PERCENT LETHAL DOSE FOR THE CHICK EMBRYO BRITISH JOURNAL OF RADIOLOGY, 1957, 30 (355): : 350 - 351
- [40] SINTERED 50-PERCENT FE-50-PERCENT NI MAGNETIC-MATERIALS INTERNATIONAL JOURNAL OF POWDER METALLURGY, 1981, 17 (02): : 119 - 125