【简答题】我们利用教材第52页所示装置仿照科学家二百多年前的方法进行探究空气成分的活动,请你思考并回答下列问题: (1)红磷在集气瓶中燃烧,与什么气体发生反应?写出反应的化学方程式______ (2)田绘同学在实验时,发现进入瓶里的水少于集气瓶容积的 1 5 ,她分析了下列原因,你认为不正确的是______ A.红磷的量不足B.应用木炭代替红磷C.装置可能会漏气D.未冷却至室温就打开弹簧夹 (3)红磷的火焰...
【简答题】石棉纤维的结构、形态、性能、特点和用途。
【简答题】This evening dress is rather expensive since it is made ______.
【单选题】Her dress was spotlessly clean and well made,but it was______kind of ______dress which the daughter of a poor man might have worn.
【判断题】基础代谢率随年龄增长逐渐升高,年龄越大,代谢率越高。
【单选题】—Your dress looks nice. Is it silk? —Yes, and it's___Hangzhou. [ ]
【单选题】What does the woman mean?
A.
She made the dress herself.
B.
Her mother bought the dress for her.
C.
Her mother made the dress for her.
【单选题】若某单位拟采用从省级以上人民政府财政部门建立的供应商库中选取的方式来产生符合资格条件的供应商名单,如果该单位拟向3家供应商发出邀标文件,那么最少应从供应商库中抽取( )家符合资格的供应商作为备选?
【单选题】This dress is made of ( ), isn’t it?
【简答题】Where is the dress made? It is made in __________.