基本解释n.公用电话交换网同根派生 PTSN相关词英汉例句Effect of Alkali Metals Addition on the Interaction Between Active Constituents and Alumina Support of PtSn Catalysts for Dehydrogenation of Propane 碱金属离子对丙烷脱氢催化剂中活性组分与载体间作用的影响PTSN更多例句