已知复数z=a+bi(a、b∈R+)(i是虚数单位)是方程x2-4x+5=O的根,复 发布时间:2018-04-12 06:38 │ 来源:www.tikuol.com 题型:问答题 问题: 已知复数z=a+bi(a、b∈R+)(i是虚数单位)是方程x2-4x+5=O的根,复数ω=u+3i(u∈R)满足,求u的取值范围.
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题型:问答题 某施工单位承建某公司高档20层钢结构写字楼1幢;总建筑面积为24000m2,抗震设防烈度为7度。钢结构构件中,放样的内容包括核对图样的安装尺寸和孔距,以1:1大样放出节点,核对各部分的尺寸,制作样板和样杆。环境温度在5~38℃之间时,可进行涂装。本施工单位采用B类防火涂料装。钢结构构件制作质量检验合格后进行除锈和涂装。一般安装焊缝处留出( )mm暂不涂装。A.60~70B.30~50C.65~75D.50~80 查看答案