催化剂

• The explicitly stated reason for this study was to compare the quality of catalysts supplied from various manufacturers .
  明确宣布这个研究是为了比较各个制造厂家生产的催化剂质量。
• The strength testing of extruded catalysts is complicated by three factors when compared to the testing ringformed catalysts .
  挤条催化剂的强度测试与环状催化剂相比，复杂的因素有三。
• Impurities that promote deterioration of polymers can be foreign materials, such as residues from polymerization catalysts .
  促使聚合物劣化的杂质可能是外加的物质，如残存的聚合用催化剂。
• The overall industry has not, to date, standardized on any particular test apparatus design for any of the three type tests .
  到现在为止，整个催化剂工业关于这三种测试装置都还没有标准化。