【判断题】旋挖钻机正常工作每240h更换一次机油。
【单选题】“Of course, the rivers and valleys and borders were long ago mapped; our blank spaces are the few remaining holes in the global communications network. ... But quite soon those gaps will be filled.” T...
【简答题】已知复数z=(2m 2 +3m-2)+(m 2 +m-2)i,(m∈R)根据下列条件,求m值. (1)z是实数; (2)z是虚数; (3)z是纯虚数; (4)z=0.
【简答题】已知命题P:复数z 1 =3-3i,复数 z 2 = m 2 -4m-10 m+2 +( m 2 -2m-12)i,(m∈R) ,z 1 +z 2 是虚数;命题Q:关于x的方程2x 2 -4(m-1)x+m 2 +7=0的两根之差的绝对值小于2.若P∧Q为真命题,求实数m的取值范围.
【单选题】已知z 1 =m 2 -3m+m 2 i,z 2 =4+(5m+6)i,其中m为实数,若z 1 -z 2 =0,则m的值为( )
【单选题】从监理大纲、监理规划和监理实施细则内容的关联性来看,监理规划的作用是:( )。
【简答题】Of course, the rivers and valleys and borders were long ago mapped; our blank spaces are the few remaining holes in the global communications network.自然,河流、山谷和边疆许久之前就已经___地图上了,今天我们说的___是指全球通讯网络中仅剩的几个_...
【单选题】Of course, the rivers and valleys and borders were long ago mapped; our blank spaces are the few remaining holes in the global communications network. ... But quite soon those gaps will be filled. (Pa...