建筑施工的伤亡事故主要有____。
A.高处坠落
B.物体打击
C.违章操作
D.触电和机械伤害
E.坍塌
参考答案：A, B, D, E
So difficult _____ it to live in an English-speaking country that I determined to learn English well. [ ]
A. I did feel
B. did I feel
C. I have felt
D. have I felt
男性，23岁。高处坠落伤，右侧臀部着地，疼痛伴运动障碍并有休克表现。
首先考虑的诊断是（）
A.软组织挫裂伤
B.腰椎骨折
C.骨盆骨折
D.股骨颈骨折
E.股骨粗隆间骨折
