无极绳绞车司机必须在操作地点操作，有硐室的在（）后操作。
A.语音信号
B.电机
C.减速机
D.操作台
参考答案：D
男，22岁，右股骨下端疼痛2个月。体检：右股骨下端偏内侧局限性隆起，皮温略高，皮肤浅静脉怒张，明显压痛，膝关节运动受限。X线片股骨下端溶骨性骨破坏，可见Codman三角。诊断为
A．软骨肉瘤
B．内生软骨瘤
C．骨肉瘤
D．尤文肉瘤
E．骨巨细胞瘤
—They is an look on his face. What for?
—Because he heard the news about his students just now.[ ]
A. excited; exciting
B. exciting; excited
C. excited; excited
D. exciting; exciting
