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考虑进入建筑物的外来导电物为电力线路(TN-S制)、闭路电视线路、金属管道时,设击在建筑物上的雷电流为150kA,问电力线路上可能分配到的雷电流为每相多少() kA
古井贡酒的产地位于( )。
尖轨在使用状态下,尖轨顶铁和基本轨离缝不大于()。
The InnoDB engine has a feature known as clustered indexes. Which three statements are true about clustered indexes as used in InnoDB?()
毫秒裂解炉与普通裂解炉相比有什么特点,前者采取什么手段才能使停留时间降至毫秒级?
肾后性急性肾衰竭的特征().
症见泄泻清稀,甚至如水样,腹痛肠鸣,胸脘痞闷,纳少泛呕,肢体倦怠,舌苔白腻,脉濡缓,治宜选用
采用一个0—2000欧的电位器,构成调压器,当在电位器电阻为1000欧处引出引线作为输出端,接人电阻为100欧的负载,当电位器的输入电压为220伏时,试计算: 电路的总电流。
饥饿时提供能量的主要物质是()
男性,3岁。右腹股沟可复性包块1年余,玩耍后不停哭闹伴呕吐6小时。查体:右侧阴囊肿胀,内可触及肿块,肿块呈蒂状延至腹股沟部,触痛明显,不可还纳。术中见疝内容物系小肠,颜色已成暗紫色,疝环狭小不易回纳,遂切开疝环解除压迫,此时你如何判断肠管是否失去活力。()
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