搜题请搜索小程序“爱下问搜题”
问题 选择题

只用一种试剂或一种方法，经一步实验就可将O2，H2，CO2和空气四种气体区别开来的是 [ ]

A．石灰水

B．带火星的木条

C．紫色石蕊试剂

D．燃着的木条

答案

答案：D

选择题

如图所示，杠杆处于平衡状态，则F的力臂是

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

A．OA

B．OC

C．OD

D．FD
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单项选择题 A1/A2型题

女性，53岁。右股骨上端疼痛20天。1年前曾行乳癌根治术。查体：右股骨上端肿胀压痛，右髋活动受限。X线检查：右股骨颈及转子下溶骨性破坏。最可能的诊断是（）

A.骨肉瘤

B.软骨肉瘤

C.纤维肉瘤

D.骨巨细胞瘤

E.乳癌骨转移
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