【单选题】70,000 tons of ______ oil has poured out of the damaged tanker into the sea.
【简答题】研究物质的性质必须取用纯净物,下列物质中属于纯净物的是( ) A.干冰 B.合金 C.石油 D.空气
【简答题】Trading Co issued an offer to Textile Company to sell 1,000 tons of imported cotton. Among other things, the offer contained the terms and conditions as follows: (i) price of cotton – RMB 20,000 yuan/...
【单选题】研究物质的性质必须取用纯净物,下列物质中属于纯净物的是 [ ]