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The homogeneity of certified reference material is studied by acoustic emission method for composite solid propellant burning rate.
采用声发射燃速测试方法研究了复合固体推进剂方坯燃速的均匀性。
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At issue is the sale by Hungary's Ministry of Environment and Water of 800, 000 certified emission-reduction credits (CERs).
ECONOMIST: Carbon markets
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