【单选题】While sometimes it’s necessary to have phone calls in public, loud phone conversations are not so .
【单选题】★393.蜜汁中甜味调料最好的是( )。
【简答题】已知正四棱锥的底面面积为4cm 2 ,体积为4cm 3 ,设它的侧面上的斜高与底面所成角的大小为θ,则sinθ的值是______.
【单选题】正四棱锥(底面正方形,顶点在底面的射影是底面的中心)的底面面积为Q,侧面积为S,则它的体积为( )
【单选题】It’s necessary for us every subject well.
【单选题】一正四棱锥的底面边长为2,侧棱与底面所成角为 ,则这个四棱锥的侧面积为 [ ]
【简答题】It’s necessary for her to change her dress after a busy day. She needed __ her dress after a busy day.
【单选题】When stand-by engine instructions have been received, it’s necessary to make it sure that all valves in the various systems are .