【简答题】Susanna Gordon celebrated her 25th birthday on June 1st. She took the TOEFL test at 2:00 p.m. that afternoon. She studied all morning because she was worried about the test, but while she was taking t...
【单选题】一个平面经过粗铣、精铣、平面磨削,最终可达到的经济精度等级为:
【单选题】图书馆公共服务区开放时间是________。
A.
7:00-22:00, 每周五17:30闭馆
B.
8:00-22:00, 每周五17:30闭馆
【简答题】聚氯乙烯的缩写代号是____聚丙烯的缩写代号是____,聚碳酸脂缩写代号是____,PE是____的缩写代号(见《塑料的分类》)
【单选题】I ate ________ sandwich while I was waiting for ________ 20:08 train. [ ]