化学与生产、生活密切相关,下列有关说法正确的是 A . 将煤进行液化处理有助于减少 CO 2 等温室气体的排放 B . 为防止食品氧化变质,常常在包装袋内放入硅胶或生石灰 C . 锅炉水垢中的 CaSO 4 通常先用 Na 2 CO 3 溶液处理后再加酸溶液除去 D . 天然纤维、合成纤维和人造纤维组成元素完全相同
【简答题】选出正确的句子,并将答案朗读发送。 A:_________________________? B: A domestic trip. 1 May I help you? 2 Would you like to go on a domestic trip or an outbound one? 3 You can ski, skate or visit the Harbin Ice World.
【简答题】Few people ever took notice of Mr. Jimmy Tan whenever he entered a room. He was a shy, quiet and man who preferred to keep to himself in public. On the other hand, Mr. Thomas Kim, a fellow scie...