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【简答题】
无线电广播中波段的频率范围是535 kHz到1605 kHz，试计算中波段电磁波波长的范围。
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【单选题】西阁夜 1 杜 甫 恍惚寒山暮,逶迤白雾昏。 山虚风落石,楼静月侵门。 击柝 2 可怜子,无衣 3 何处村。 时危关百虑,盗贼尔犹存。 [ 注]1 766 年,诗人移居夔州,初寓山中客堂,秋后,离西阁。该诗写于移居西阁时。2击柝,敲梆子巡夜。《易》:“重门击柝,以待暴客。”是说设置多道屋门,击柝巡夜,以防强盗。3《诗·秦风·无衣》:“岂曰无衣,与子同袍。” 1 . 下列对这首诗的赏析,不恰当的一...
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【单选题】I see this principal all over as I go through my day. I see rims on car wheels that cost upwards of $ 500, just for a little bit of decoration on a vehicle. I see people spend four or five dollars for...
A.
people are getting much richer than before
B.
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C.
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【单选题】属于中国古建筑成熟时期的是:
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【多选题】下面哪些是物理层的传输介质?(请选择3个答案)
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B.
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【简答题】阅读下面这首诗,完成11~12题。 晚登龙门1驿楼 许浑鱼龙多处凿门开,万古人知夏禹材。青嶂远分从地断,洪流高泻自天来。风云有路皆烧尾,波浪无程尽曝腮2。心感膺门3身过此,晚山秋树独徘徊。[注] 1龙门:相传为夏禹治水的重要工程之一。2曝腮:据传,鲤鱼跃过龙门,“即有云雨随之,天火自后烧其尾,乃化为龙矣”。无法跃过者,则“曝鳃点额,血流此水”。 3膺门:东汉李膺礼...
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