砂培 sand culture
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1、For()commodities as oil,sand and timbe
For()commodities as oil,sand and timber,rail is cheaper than road.AunpackedBunpackagedCbulkDbundled
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continuous culture
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原生质体培养(protoplast culture)
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4、()about 20 sq.m to be sand-blasted.
()about 20 sq.m to be sand-blasted.AThe rusting areaBThe rusted areaCThe corroded areaDThe corrosive area
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分批培养(batch culture)
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组织培养(tissue culture)