题干

如图所示,是某核动力航空母舰和从它上面起飞的直升飞机的示意图.那么,下列与物理知识有关的说法中正确的是(   )

A:当直升飞机悬停在航空母舰的上空时,如果以地面为参照物,它们都是运动的

B:当直升飞机从航空母舰的甲板上起飞后,航空母舰浸在大海中的深度将保持不变

C:直升飞机和航空母舰之间的联系,是通过超声波或次声波来实现的

D:核动力航空母舰所利用的核能是通过重核裂变释放的一种能量

上一题 下一题 0.0难度 选择题 更新时间:2019-04-02 09:48:19

答案(点此获取答案解析)

D

同类题4

阅读理解

    On a rainy night three years ago my dear mom went to accompany her Lord. She did it her way.

    I got the call at work, and l headed home quickly. Mom and Dad lived on a small farm that they had owned since I was seven. I hated going there every weekend. There was nothing for a young girl to do but watch the one station on the old TV set, if the weather allowed reception.

    My mom, on the other hand, loved the peace and quiet of the land. The place was rural, with no indoor plumbing or heat. We had a big wood stove in the kitchen that did its best to heat the little farmhouse, but it always seemed cold and too quiet to me.

    In the evenings, my mom and I would sit for hours singing in the little kitchen. I sang the melody and Mom harmonized. Her favorite song was “Moon River” and we sang it over and over. Mom told me stories about how when I was a little girl I could sing before I could talk.

    As time passed, I had my own children and went to visit them every week or two. The kids loved the farm and the tractor rides with my dad. Me, well, I still hated the silence of the farm. While my mom loved to sit at her kitchen table and look out at her garden and flowers and retell all the old stories, I missed the hustle and bustle of my life at home. But I sat there listening quietly as she reminisced.

    Now, I sat back in the silence and the silence was deathly so I finally leaned over to turn on an old radio. Music always comforted me. My heart skipped a beat. “Moon River” was playing on the radio. I sat there wordless, with a tear running down my cheek, as I listened to every familiar note.