______ are composites with tungsten, silica coated with graphite, or carbon filaments as a substrate upon which boron is deposited by a vapor-deposition process (CVD).
【简答题】I am fond of my sister but she has one __小题1:__. She can be really __小题2:__. Although she didn’t know the best way of getting to places, she insisted that she organize the trip __小题3:__. Now I know th...
【简答题】MissGreen didn’t tell us _____ in 2002. A. where does she live B. Where she lives C. where did she live D. where she lived 2. Would you please tell me ______? A. when did he come home B. where would h...