下列不利于兰州市“创建国家卫生城市”的做法是( )
A:植树造林,绿化环境
B:道路洒水,空中喷雾
C:焚烧垃圾,扬尘作业
D:加快地铁建设,减少机动车尾气排放
2004年,美国科学家通过“勇气”号太空车探测出火星大气中含有一种称为硫化羰(化学式为COS)的物质.已知硫化羰的结构与二氧化碳相似,能在空气中燃烧.下列有关硫化羰的说法正确的是( )
根据所给首,与出所缺单词。I can see a v ____ tape on the desk.Li Gang likes m ____ , but he doesn’t music.The p ____ is very good. I also want to buy one.This r____ is very big, but that one is very small.I n ____ a pen, two pencils and some books.