1.综合题- (共1题)
CH3OH(g)。
根据题意和所给图象完成下列各题：
①反应达到平衡时，平衡常数表达式K＝________，
②升高温度，K值__(填“增大”“减小”或“不变”)
（2）一定温度下，将3 mol A气体和1 mol B气体通入一密闭容器中，发生如下反应：3A(g) + B(g)
xC(g) 请填写下列空白：若容器体积固定为2 L，反应2 min时测得剩余0.6 mol B，C的浓度为0.4 mol/L。①x=________
②若反应经4 min达到平衡，平衡时C的浓度________ 0.8 mol/L(填“大于”、“等于”或“小于”)。
③平衡混合物中，C的体积分数为22%，则B的转化率是______________。
（3）运用化学反应原理研究氮、氧等单质及其化合物的反应有重要意义。
①合成氨反应N2(g)+3H2(g)
2NH3(g)，若在恒温、恒压条件下向平衡体系中通入氩气，则平衡__________移动（填“向左”“向右”或“不”）；使用催化剂，上述反应的△H________（填“增大” “减小” 或“不改变”）。②有人设想寻求合适的催化剂和电极材料，以N2、H2为电极反应物，以HCl—NH4Cl为电解质溶液制造新型燃烧电池,放电过程中，溶液中铵根离子浓度逐渐增大。请写出该电池的正极反应式_________________________。
2.选择题- (共7题)
——I hear you______ in a sports center. What's it like?
——Well, it's very hard work and I'm always tired, but I don't mind.
——I hear you______ in a sports center. What's it like?
——Well, it's very hard work and I'm always tired, but I don't mind.
——I hear you______ in a sports center. What's it like?
——Well, it's very hard work and I'm always tired, but I don't mind.
Since the 1970s, scientists have been searching for ways to connect the brain with computers. Braincomputer interface(BCI) technology could help people with disabilities send commands to machines.
Recently, two scientists, Jose Millan and Michele Tavella from the Federal Polytehnic School in Lausanne, Switzerland, show a small robotic wheelchair directed by a person's thoughts.
In the laboratory, Tavella operated the wheelchair just by thinking about moving his left or right hand. He could even talk as he watched the vehicle and guided it with his thoughts.
“Our brain has billions of body cells(细胞). These send signals through the spinal cord(脊髓) to the body part to give us the ability to move. But spinal cord injuries(脊柱受伤) or other conditions can prevent these weak electrical signals from reaching the body part.” Tavella says. “Our system allows disabled people to communicate with outer world and also to control machines.”
The scientists designed a special cap for the user. This head cover picks up the signals from the scalp(头皮) and sends them to a computer. The computer finds meanings of the signals and commands the wheelchair with an engine. The wheelchair also has two cameras that tell objects in its path. They help the computer react to commands from the brain.
Prof. Millan , the team leader, says scientists keep improving the computer software that finds meanings of brain signals and turns them into simple commands.” The practical possibilities that BCI technology offers to disabled people can be grouped in two kinds: communication, and controlling objects. One example is this wheelchair.”
He says his team has set two goals. One is testing with real patients, so as to prove that this is a technology they can get advantages from. And the other is sure that they can use the technology for long.
3.单选题- (共2题)
A. 石墨作阴极，纯铜作阳极
B. 含有锌、银的铜合金作阴极，石墨作阳极
C. 纯铁作阳极，纯铜作阴极
D. 含有锌、银的铜合金作阳极，纯铜作阴极
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【1】题量占比
综合题:(1道)
选择题:(7道)
单选题:(2道)
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【2】：难度分析
1星难题：0
2星难题：0
3星难题：0
4星难题：0
5星难题：0
6星难题：2
7星难题：0
8星难题：1
9星难题：0