一般情况下导线弧垂最低点的应力不应超过破坏应力的40%,当导线弧垂最低点的应力为破坏应力的40%时,说明导线悬挂点的最大 一般情况下导线弧垂最低点的应力不应超过破坏应力的40%,当导线弧垂最低点的应力为破坏应力的40%时,说明导线悬挂点的最大应力可为下列哪一项数值?(以破坏应力为基 分类:理工类 题型:单选题 查看答案
假设场地面积为17360m2,要求场地水平面上的平均照度为1600Ix,场地照明灯具采用2000W金属卤化物灯,光源光通 假设场地面积为17360m2,要求场地水平面上的平均照度为1600Ix,场地照明灯具采用2000W金属卤化物灯,光源光通量2000001m,镇流器功率为光源功率 分类:理工类 题型:单选题 查看答案
Mary just told us a very fascinating story. Mary just told us a very fascinating story.A.strange B.frightening C.difficult D 分类:理工类 题型:单选题 查看答案
He has trouble understanding that other people judge him by He has trouble understanding that other people judge him by his social skills an 分类:理工类 题型:单选题 查看答案