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【单选题】
下列行为属于妨碍公共安全行为的是A.
学生喜爱音乐，经常深更半夜将家中的音响声调至最高，影响了周围居民的正常休息
B.
2016年春节期间，携带大量鞭炮乘坐火车，被乘警发现
C.
一名学生双休日结伴去公园游玩，高兴之余，在景点文物上刻下某某“到此一游”
D.
学生，不想学习，夜不归宿，屡教不改，后来竟发展到持刀抢劫，致人重伤
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举一反三
【简答题】升降压斩波电路呈现升压状态的条件为 。
【简答题】A．Only two years after his retirement. B．Only three years after his retirement. C．Only one year after his retirement. D．Only four years after his retirement.
【单选题】What happened in 1996?
A.
Retirement stopped being practiced.
B.
Age limitation in retirement was abolished.
C.
Retired people were no longer entitled to pensions.
D.
Age discrimination was legally abolished.
【简答题】A．only one year after his retirement. B．only two years after his retirement. C．only three years after his retirement. D．only four years after his retirement.
【简答题】退休(retirement)
【简答题】化疗药物可通过( )、( )、( )等途径，对经常接触的护士带来一定的潜在危害。
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