一定量混合气体在密闭容器中发生如下反应：xA(g)+yB(g)zC(g)。该反应达到平衡后，测得A气体的浓度为0.5 mol·L-1。在恒温下将密闭容器体积扩大到原来的2
Would you like some coffee? Yes, please. By the way, do you have any milk? I prefer coffee ______ milk. A. from B. with C. to D. for
苏轼在《水调歌头》（明月几时有）中队远方亲人表示美好祝愿的句子是： ， 。
根据所给单词完成句子. 1. Is this your ______ (叔叔)? 2.Kate and Gina are his ________ (姐妹). 3.These are my ____________ (朋友). 4.Those __________ ( 女孩 )are her sisters. 5.Look,
---Are there any oranges in the bag? ---Yes, but only ______. A. few B. a few C. a little
(2013·宁波八校联考)如图甲是某景点的山坡滑道图片，为了探究滑行者在滑道直线部分AE滑行的时间．技术人员通过测量绘制出如图乙所示的示意图．AC
下列物质的变化，不能通过一步化学反应完成的是 A、CO2H2CO3 B、SiO2Na2SiO3 C、Na2O2Na2CO3 D、SiO2H2SiO3
Which of the following words is pronounced /geit/? A. gate B. great C. greet D. get
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