①转动细准焦螺旋              ②转动粗准焦螺旋              ③移动装片

④调节光圈                         ⑤转动转换器

A．③―⑤―②―①                                      B．④―③―②―⑤

C．③―①―④―⑤                                      D．③―⑤―④―①