电子计算机体层扫描(CT)的适应证是,除了:
A.眼内肿物B.血管畸形C.微血管瘤D.眶骨骨折E.眼内异物
参考答案:C
关于公式R=UI,下列说法正确的是( )
A.电阻与电压成正比
B.对同一导体,它两端的电压与通过它的电流之比是变化的
C.电阻的大小与电压、电流大小无关
D.电阻与电流成反比
During an annual FCC inspection().
A.All required documents and publications may have to be produced
B.Licensed GMDSS radio operators may be required to demonstrate equipment competencies
C.All required equipment must be fully operational
D.All of the above