某教室长7.65 m，宽4.6 m，高3.5 m，这间教室可容空气____kg.(ρ_空气 =1.3 kg/m³ )

下列哪一种货物由火车运送最适宜（   ）

古诗阅读欣赏。
                                                                                       鸟鸣涧
                                                                                        唐 王维
                                                                      人闲桂花落，夜静春山空。
                                                                     月出惊山鸟，时鸣春涧中。