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【单选题】
距牵引供电设备带电部分不足（）的燃着物体，使用水或灭火器灭火时，牵引供电设备必须停电。A.
2米
B.
3米
C.
4米
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皮皮学刷刷变学霸
举一反三
【简答题】糖原、淀粉和纤维素分子中都有一个还原端，所以它们都有还原性。( )
【单选题】So does an attitude which sees the public only in terms of large, malleable numbers—as impersonally as does the clattering subway turnstile beneath the office towers.
A.
innumerable
B.
rigid
C.
flexible
D.
inoperable
【单选题】Why does Amina have a very positive attitude when it comes to learning foreign languages?
A.
Because she has many Chinese friends that can help her.
B.
Because she is probably a quick learner, so she has an advantage over people like Alex.
C.
Because she comes from Morocco, a country where people speak different languages so she can learn Chinese faster.
【简答题】A、B、C、D、E都是短周期元素，原子序数依次增大；A原子中电子运动的轨道只有一种形状；B、C同周期，A、D同主族．D、B能形成两种离子化合物甲和乙，原子个数比分别为2：1和1：1；E元素原子的最外层电子数是其电子总数的 1 3 ．根据以上信息回答下列问题： （1）甲、乙中含有非极性键的物质的电子式是______． （2）E、C分别形成的氢化物稳定性大小关系是______．（用氢化物的化学式作答）...
【简答题】1) What are the so-called “odyssey years”? 2) Why does the author say that the odyssey years are an unavoidable stage in reaching hood? 3) How do some young people in their odyssey years react to...
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