摘要: The author uses the example of the robot in space exploration to tell us . A. the differences between robots and men B. the reason why men need to sleep C. about the need for robots to save power D. about the danger of men working at night
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2008 年北京奥运会主体育场的外形好似“鸟巢”( The Bird Nest ).有一类硼烷也好似鸟巢,故称为巢式硼烷.巢式硼烷除 B10H14不与水反应外,其余均易与水反应生成氢气和硼酸,硼烷易被氧化.如图是三种巢式硼烷,有关说法正确的是( )
| A、这类巢式硼烷的通式是 CnHn+4 | ||||
B、2B5H9+12O2
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| C、8 个硼原子的巢式棚烷化学式应为 B8H10 | ||||
| D、硼烷与水反应是非氧化还原反应 |
| A、硼烷与水反应是非氧化还原反应 | ||||
B、2B5H9+12O2
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| C、8 个硼原子的巢式硼烷化学式应为 B8H10 | ||||
| D、这类巢式硼烷的通式是 CnHn+4 |