Field test and physical and chemical assays were performed to investigate the effects of straw mulching on the nutrient conditions of pear tree and the yield and quality of fruit.
为探讨南方梨园秸杆覆盖对梨树树体营养及梨果产量品质的直接影响，进行了梨园秸秆覆盖田间试验以及叶、果室内理化分析。
The results of test and evaluation of CT scanners used in Beijing area show that satisfactory quality control has been obtained by using physical characteristics.
研究结果用于北京市CT机成像物理性能检测评价，取得了满意的物理成像性能质控效果。
Methods The quality of microbiological AGAR medium was analyzed through physical and chemical experiments, and microbiological test.
方法通过理化实验、微生物检验，对国内外几种常用的微生物培养基用琼脂的质量进行对比分析。
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