题目

密闭容器中进行如下反应：X(g)＋3Y(g)2Z(g)，X、Y、Z起始浓度分别是0.2 mol·L－1、0.6 mol·L－1、0.4 mol·L－1，当达到平衡时，下列数据可能正确的是 A.X为0.25 mol·L－1，Z为0.5 mol.L－1     B.Y为1.2 mol·L－1 C.X为0.3 mol·L－1，Z为0.3 mol·L－1      D.Z为0.6 mol·L－1 答案： DIn California, another interesting kitchen robot has been developed, called Readybot. It can pick up objects and either store them in cabinets (橱柜) or put them in the trash. It also carries a separate floor-cleaning robot that can operate by itself. Unlike the Japanese robot, Readybot just looks more like a large box with arms and wheels.Readybot was created by engineers and designers who established a club called the Readybot Challenge. They believe that in the future millions of robots will be needed in homes to perform ordinary household tasks. Readybot is just the first step in their plan to create a robot that can do jobs not only in kitchens but in other rooms of homes and in offices as well.Clearly there are technological difficulties to solve before robots can cook a complete dinner, and there are also many safety concerns (忧虑). Not everyone (especially parents) would be comfortable with the idea of robots in their house,manipulatinghot pans and sharp knives. The European Commission recently funded(资助) a project to study these concerns. According to lead researcher Professor Chris Melhuish, “Enabling robots to work safely with humans is a key need for the future development of robotics.”【1】A. is more popular B. performs more jobsC. moves more quickly D. looks more like a person【2】A. drive you around B. clean your kitchenC. prepare food for you D. work for office workers【3】A. inventing B. avoiding C. controlling D. making【4】A. have shown great interest in kitchen robotsB. can’t wait to use kitchen robots in their homesC. might think that kitchen robots could be dangerousD. found out how to operate robots safely