题干

下列说法不正确的是(  )

A:科学家在研究物质微观结构的过程中先后使用了光学显微镜、电子显微镜、扫描隧道显微镜等观测仪器

B:H2O2在过氧化氢酶的催化下,随着温度的升高,分解速率持续加快

C:甲醇、肼、氨等燃料电池的能量转换效率远高于普通燃料燃烧的能量转化效率

D:钠和钾的合金在室温下呈液态,可用于快中子反应堆作热交换剂

上一题 下一题 0.0难度 选择题 更新时间:2019-04-08 11:19:39

答案(点此获取答案解析)

B

同类题2

阅读短文,根据短文内容,从短文后的五个选项中,选出能填入空白处的最佳选项。选项中有一项为多余选项。
    David Beckham was born on 2nd May, 1975, in London. When he was a young boy, he played football whenever he had the chance. Sometimes he would go and watch a game with his friends.____ . This led to him going for a visit to a football training camp in Spain. As a boy at secondary school he played for not only his school but also his country team.
On 8th July, 1991, he became a member of Manchester United.____ . On 2nd April, 1995, he played his first major football league game against Leeds United. During 1995 and 1996, David became a regular member of the team and Manchester United won in both seasons, with David scoring many goals.
____ . In the first game of the 1996/7 season, he scored an amazing goal from beyond the halfway line. Seeing the goalkeeper a little way out of his goal, David sent the ball over the goalkeeper's head and into the goal. He continued to score astonishing goals, especially from free-kicks.
    David Beckham is a great player, but he is different from most other players. He has a real love for football. ____ . He is always on the move with the ball or running to pick up a pass from another team member. He also has his feet on the ground and behaves in a very natural and relaxed way.

A. David Beckham is 180 cm tall and weighs 47kg
B. He won a prize at the age of twelve
C. When he is training, he never rests
D. David Beckham became very famous overnight
E. This means that he could practice football as much as he wanted to