问题
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规划人口为25万的城市应采用的防洪标准为()年一遇。A.10~20B.20~50C.50~100D.100~200
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20,26,35,50,7l,() A.95B.104C.100D.102
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20, 26, 35, 50, 71,().A.95 B.104C.100 D.102
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20, 26, 35, 50, 71,().A.95 B.104C.100 D.102
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正比计数器型剂量仪的灵敏度可比同等体积的空腔电离室高()倍。A.101-102B.102-103C.103-104D.104-
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影像增强管的总增益一般在A.102~103之间B.10~102之间C.104~105之间D.103~104之间E.105~106之间