A. 对 B. 错
A. select a1 a3, a2 from abc bc; B. select a1 as a3, a2 from abc as bc; C. select a1 as from, a2 from abc; D. select ab.a1, a2 from abc bc;
A. stream B. cookies C. time chart D. overview
A. word B. excel C. testlink D. quality center