急性腹痛考虑胰腺炎还需与下列哪些疾病相鉴别()。
A.溃疡病穿孔
B.胆囊穿孔
C.急性胃炎
D.胆道结石
E.急性较窄性肠梗阻
参考答案:A, B, C, D, E
Liu Ying lives with her grandparents in the countryside because _____ of her parents work in the city. [ ]
A. both
B. either
C. neither
如图所示,轻绳MO和NO共同吊起质量为的重物。MO与NO垂直,MO与竖直方向的夹角。已知重力加速度为。则( )
A.MO所受的拉力大小为
B.MO所受的拉力大小为
C.NO所受的拉力大小为
D.NO所受的拉力大小为