题目

_________________ fine equipment, three Chinese astronauts in Shenzhou VII came back, ______. A．Having owned up; soundly and safely        B．having made up of; safety and sound C．Armed with; safe and sound          D．Being concentrated on; safe and sound 答案：C下列给出的三幅图，分别主要运用了什么光学知识？A、激光引导掘进方向       B、小泥人照镜子     C、有经验的渔民在叉鱼答：A                 ； B                 ； C                 。