一个四棱锥的俯视图是______.
一个四棱锥的俯视图是中间有点的四边形.
故答案为:中间有点的四边形.
患者女,50岁。反复脓血便半年,每天3~5次,在当地曾按痢疾治疗无明显效果。近1个月出现腹胀,伴阵发性腹痛。查体:消瘦,腹稍胀,软,下腹轻压痛,右下腹可扪及一肿块,质较硬,尚可活动。
首选的辅助检查()
A.大便细菌培养
B.CT
C.钡餐检查
D.纤维结肠镜检查
E.MRI
The children kept their eyes _____ when they _____ Liu Qian's tricks. [ ]
A. opening; looked
B. open; were watching
C. opening; watched
D. open; were looking