更多“为保证人身和设备的安全，电力设备外壳应接地或接零。”相关的问题
三相负载为星形接法，每相负载都为220V、60W的灯泡，若S1断开、S2、S3闭合，则下列说法中正确的是（）。
A.灯H1比灯H2、H3都亮
B.灯H3比灯H1、灯H2都亮
C.灯H1不亮，灯H2比灯H3亮
D.灯H1不亮，灯H2、H3一样亮
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动脉血气分析常用于（）
A.监测呼吸衰竭 B.监测酸碱平衡失调 C.监测肺功能 D.机械通气参数的调节 E.机械通气的疗效分析及预后判断
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黑盒测试也称为功能测试,其根据程序的内部结构和逻辑来设计测试用例,对程序的路径和过程进行测试。检查是否满足设计的需要。 ( )
A. 对B. 错
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乞巧习俗分布范围()
A.西汉水沿岸的西和长道和礼县一带的周边10多个乡镇。
B.西汉水沿岸的西和长道和礼县永兴、盐官一带的周边20多个乡镇。
C.西汉水沿岸的西和长道一带的周边10多个乡镇。
D.西汉水沿岸的西和长道一带的周边20多个乡镇。
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京信天线命名中D代表哪种接口类型（）
A.N型接口
B.SMA接口
C.7/16Din头接口
D.BNC接口
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男，45岁。主诉刷牙时牙龈出血，口腔有异味，双侧后牙及下前牙轻度松动，伴有咬合痛。如果拟诊断为成人型牙周炎，主要致病菌是（）
A.放线菌
B.牙龈类杆菌
C.乳酸杆菌
D.变形链球菌
E.嗜二氧化碳噬纤维菌
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道岔和站线的综合维修周期由（）规定。
A . 铁路局
B . 工务段
C . 维修车间
D . 检修车间
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听力原文：M: I just called the travel agency. It's all set. On June first, I'm heading for
W: Have you checked the academic calendar？ Because my classes aren't over till the seventh.Q: What does the woman imply？(13)A．The man may have to reschedule his trip.B．The man should take his vacation somewhere else.C．She hasn't called the travel agent yet.D．She doesn't know when her semester ends.
Q: What does the woman imply？(13)A．The man may have to reschedule his trip.B．The man should take his vacation somewhere else.C．She hasn't called the travel agent yet.D．She doesn't know when her semester ends.
(13)A．The man may have to reschedule his trip.B．The man should take his vacation somewhere else.C．She hasn't called the travel agent yet.D．She doesn't know when her semester ends.
A．The man may have to reschedule his trip.B．The man should take his vacation somewhere else.C．She hasn't called the travel agent yet.D．She doesn't know when her semester ends.
B．The man should take his vacation somewhere else.C．She hasn't called the travel agent yet.D．She doesn't know when her semester ends.
C．She hasn't called the travel agent yet.D．She doesn't know when her semester ends.
D．She doesn't know when her semester ends.
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切削材料层的变形、分离及切屑、刀具、工件间的摩擦所产生的热称为切削热。
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境内机构境外直接投资累计汇出的前期费用原则上不得超过其向境外直接投资主管部门申报的中方投资总额的（）。
A.10% B.15% C.20% D.25%
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贯穿于毛泽东思想各个组成部分的活的灵魂是（）
A.实事求是
B.群众路线
C.独立自主
D.艰苦奋斗
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兴奋在反射弧中传递方向是（），原因是（）。
请回答下列问题：
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汽车尾气是一种危害性很大的物质。
A.对 B.错
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能减弱心肌收缩力.延长APD和ERP的药物是
A．奎尼丁B．利多卡因C．美西律D．苯妥英钠E．妥卡尼
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