PG-5
例句释义:1.In this paper, using 7. 5-year spectroscopic monitoring data of a sample of 17 PG QSOs, we study the optical spectral slope variance.在本文中，我们利用17个PG类星体长达7.5年的光谱监测资料，研究类星体在光学波段的光谱斜率变化。
2.We have worked through Unit 5, Lesson A & B, pg 54-57, in both the Workbook & Student Book.我们已经学习了包括教材以及练习册第五单元的A、B课，54-57页。
3.The PG Series of planetary winches are maximum rated from 5, 600 lb to 15, 000 lbs pne pull at the cable drum.该系列行星齿轮绞盘在电缆鼓上的最大额定值为从5,600磅到15,000磅线拉。