骨软骨瘤切除范围是() ["骨段切除","纤维膜,软骨帽","切除肿瘤,搔刮邻近髓腔","纤维膜、软骨帽、病骨","纤维膜、软骨帽、病骨,基底周围部分正常骨和骨膜"]
恶性肿瘤的诊断,最重要的依据是() ["病程短、发展快","肿块质硬、固定","血清酶学及免疫学检查","X线、放射线核素或超声波检查","病理学检查"]
属于物理层的设备() ["交换机","路由器","中继器","集线器"]
()是计算机接入网络的接口设备。 ["网卡","路由器","网桥","网关"]
什么是牵引电动机的半悬挂?有何优缺点?
什么是牵引电动机的全悬挂?