【单选题】
表示1h机电破坏荷重力为98.1KN(10tf)的普通悬式绝缘子的型号是___。
A. XW－4.5
B. XP－10
C. XWP－7D
D. XP－4.5
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答案
B
解析
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材料力学的任务就是对构件进行___的分析和计算，在保证构件能正常、安全地工作的前提下最经济地使用材料。
A. 强度、刚度和稳定度
B. 强度、刚度和组合变形
C. 强度、塑性和稳定度
D. 剪切变形、刚度和稳定度
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采用普通水泥混凝土其标号为150浇注的基础，养护时期的日平均气温为15℃。要进行整体立塔或紧线时，混凝土基础最少养护天数不得少于___天。
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单相隔离开关和跌落式熔断器三相垂直排列者，停电时应___。
A. 从上到下拉开各相，相同
B. 从上到下拉开各相，相反
C. 从下到上拉开各相，相同
D. 从下到上拉开各相，相反
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单相隔离开关和跌落式熔断器三相水平排列者，停电时应___，送电操作顺序()
A. 先拉开中相，后拉开边相，相同
B. 先拉开中相，后拉开边相，相反
C. 先拉开边相，后拉开中相，相同
D. 先拉开边相，后拉开中相，相反
【单选题】
___最适合于缺少砂石、水源的塔位或者需要在冬季施工而不宜在现场浇制基础时采用。
A. 现场浇制的混凝土和钢筋混凝土基础
B. 预制钢筋混凝土基础
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紧凑型输电技术、大截面导线输电技术、耐热导线输电技术和同塔多回输电技术等新型输电技术的技术精髓是___。
A. 降低输电线路的工频电场
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In , the British Parliament passed two important acts to establish a welfare state.
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