【单选题】施工期间控制混凝土质量一般以( )强度为准。
【单选题】中性点装设消弧线圈后,接地故障时的电感电流大于电容电流,此时的补偿方式为()。
【简答题】中性点经装设消弧线圈后,接地故障的电感电流大于电容电流,此时的补偿方式为()
【单选题】中性点装设消弧线圈后,接地故障时的电感电流大于电容电流,此时的补偿方式为()。
【单选题】The system has been designed to give students quick and easy ______ to the digital resources of the library.
【简答题】磨高速钢车刀时容易出现退火现象,这主要是由于( )或( )造成的
【单选题】Directed research may become a danger to the future of science because______.
A.
pure research may be neglected under this system
B.
the division between the pure and the applied scientist will disappear
C.
the interdependence of pure and applied science may be ignored
【单选题】设xoy平面为地面,其上方有两个沿着y轴方向放置的等幅馈电的半波振子天线,工作波长为λ,中心坐标分别为(-0.125λ,0,0.5λ)和(0.125λ,0,0.5λ),相位分别为0和π/2,回答下列问题包含了地面的天线系统的H面是:【】