题型:问答题 简答题 Lots of people were reported______ in the earthquake, but so far we haven’t found out the exact number yet.A.to dieB.to be dyingC.deadD.to have been dead 查看答案
题型:问答题 简答题 已知氧气的密度为1.43g/L,空气的密度为1.29g/L,一般情况下,正常成年人每分钟吸入8L氧气。问正常成年人每分钟需要吸入空气多少升?在标准状况下,8L氧气的质量是多少克?所需要空气的质量为多少克? 查看答案