题目

如图所示是一款健身机。如图乙所示前后推拉拉杆，可用于腿、背部部位的肌肉锻炼。下列关于健身机的分析中，正确的是（ ） A . 坐垫能移动不能转动，坐垫与底座间的连接是铰链接 B . 健身的过程中，拉杆的主要受力及变形方式是受拉伸 C . 提高健身机稳定性最有效的措施是加长底座 D . 确定两握把间的距离时，考虑人的静态尺寸 从方框中选择合适的单词，并用其正确形式补全对话。 go     wonder     happen    find      search Mary: What (1)　　    　 to you, Jack? You look worried.  Jack: My dog (2)　　    　 out by itself two days ago. And it didn’t come back. Mary: Did you (3)　　    　 the neighbourhood?  Jack: Yes, I did. I searched every corner. But I couldn’t (4)　　    　 it. Mary: Don’t worry. It may come back soon.  Jack: I’m (5)　　    　 where it can go. Mary: Why not have a look at the nearby park?  Jack: Good idea! Would you like to go with me? Mary: Sure. Let’s go.