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【判断题】
在将低速支路信号复用成STM-N信号时经过2个步骤:映射、 复用。
A. 对
B. 错
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答案
B
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在接入网中,如果全部由无源器件组成,不包括任何有源节点,则这种光接入网就是PON
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在进行PON网络测试时,利用光纤识别器可以发现光纤故障所在。
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在一个PON口下有多个ONU设备,其中有一个ONU的接收光功率为-9dbm,另外有一个ONU的接收光功率为-25dbm,这个PON口下 设备能正常开通。
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在用户电脑安装软、硬件(尤其安装网卡)之前,应当面开机检测,确认电脑无故障后在施工,以避免产生不必要的矛盾。
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15. — It’s difficult for the village children to cross the river for school. — I think a bridge ________ over the river. A. should be built B. is being built C. has been built D. was built
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18. — Did you see a girl in yellow pass by just now? — No, sir. I ________ a magazine. A. read B. am reading C. was reading D. would read
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19.In fact, my parents are not only kind to me, but also strict ________ me. A. at B. to C. for D. with
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20. The boy_____ a yellow sweater can_____ himself now. A. wearing; dress B. putting on; wear C. put on; dress D. dressing; wear
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21. —Jack, I haven’t seen your brother for a long time. — He ________Shanghai on business for two months. A. went to B. has gone to C. has been in D. has been to
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23. — Look! The man standing at the gate ______ be our headmaster. — No, it _______ be him.He is holding a meeting in the office now. A. must; can’t B. must; mustn’t C. can’t; can’t D. can’t; mustn’t
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24. The Japanese government must do everything ________ polluted water from running into rivers, lakes, seas and oceans. A. keep B. kept C. Keeping D. to keep
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B. B
C. C
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【单选题】
25. —Hi, Jack.Did you go to Jim’s birthday party? —No, I felt so sad.I . A. didn’t invite B. am not invited C. wasn’t invited D. hadn’t invited
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B. B
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