It was difficult __________ something because it was dark.
A:see
B:to see
C:sees
D:seeing
如图所示,渔民在叉鱼时,为了能叉到鱼,鱼叉应对准( )
如图,用半径为3cm,圆心角为120°的扇形围成一个圆锥的侧面,则这个圆锥的底面半径为( )
A.一个多边形的每个内角都等于150°,则这个多边形是____边形.
B.用计算器计算:sin15°32'____(精确到0.01)