已知圆锥的母线长力30,侧面展开后所得扇形的圆心角为120°,则该圆锥的底面半径为( )。
10
某患者既往消化性溃疡,主诉上腹部不适,口腔喷射出暗红色血液,并伴有食物残渣,根据以上描述,该患者的症状可能为()。
A.咯血
B.呕血
C.呕吐
D.不确定
As a result of my laziness, I failed _____ my work in time. [ ]
A. and finished
B. to finish
C. and finishing
D. to finished