基本解释n.公用電話交換網同根派生 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 堿金屬離子對丙烷脫氫催化劑中活性組分與載躰間作用的影響PTSN更多例句