问题
填空题
上心盘底座平面与下心盘立棱间距不小于（）。
答案
参考答案：3mm
搜题请搜索小程序“爱下问搜题”
上心盘底座平面与下心盘立棱间距不小于（）。
参考答案：3mm
| 完形填空 | ||||
| My father brought home a sailboat when I was ten, and almost each Sunday in summers we would go sailing.Dad was quite skilled in sailing, but not good at __1__.As for me, I __2__ both before twelve because of living close to Lake Ontario. The last time Dad and I set sail together is really __3__.It was a perfect weekend after I graduated from university.I came home and __4__ Dad to go sailing.Out we set soon on the __5__lake.Dad hadn't sailed for years, but everything __6__wel  l with the tiller (舵柄) in his hands.When we were in the middle of the lake, a __7__ wind came all of a sudden.The boat was hit__8__. Dad was always at his best in any __9__, but at this moment he __10__. "John! __11__!" he shouted in a trembling voice, with the tiller still in his hands. In my memory he could fix any __12__.He was the one I always __13__ for strength and security. Before I could respond, a __14__of water got into the boat.I rushed to the tiller __15__ it was too late. Another huge wall of water __16__ the boat in a minute.We were thrown into the water, and Dad was struggling aimlessly.At that moment, I felt fiercely __17__ of him. I swam to Dad __18__and assisted him in climbing onto the hull (船壳) of the boat.Upon sitting on the hull, Dad was a little awkward about his flash of __19__."It's all right, Dad.We are safe now." I comforted him. That was the first time Dad had counted on me in a moment of emergency.More importantly, I found it was my turn to start __20__for my father. | ||||
|