【单选题】PowerPoint 2010 演示文档的扩展名是()。
【判断题】未经硫化的橡胶分子结构是线型或支链型,硫化的目的是使橡胶分子适度交联,形成体型或网状结构。
【简答题】A.be done B.to be done C.is done D.being done
【简答题】A lot of research is being done to find out______.
【单选题】PowerPoint 演示文档的扩展名是 ()
【简答题】A.to be done B.done C.to do D.being done
【单选题】With the work being done, they went out to play.
【单选题】(Being felt) that she (had done something) (wonderful), she sat down (to rest).