问题
单项选择题
螺纹联接产生松动故障的原因，主要是经受长期（）而引起的。
A.磨损
B.运转
C.振动
答案
参考答案：C
搜题请搜索小程序“爱下问搜题”
螺纹联接产生松动故障的原因，主要是经受长期（）而引起的。
A.磨损
B.运转
C.振动
参考答案：C
| 完形填空。 | ||||
| One day, a farmer was walking along a road with his son Thomas. The father said, "Look! There's a horseshoe __1__ the ground. Pick it up and put it in your bag." Thomas said, "It wastes my time." His father said __2__ but he picked it up himself. When they got to a nearby town, they had a rest. There the farmer __3__ the horseshoe and with the money he bought some strawberries. The father and the son went on walking. The sun was well up in the __4__. They soon drank up their water, and there wasn't a house or even a tree for them to __5__. Thomas felt too __6__ to walk on. At this time, his father gave Thomas a strawberry __7__ he quickly ate it. After a while, his father gave him __8__ strawberry and once again, his son lost no time in putting it in his mouth. And so they __9__. The old farmer gave the strawberries and the son ate them. When Thomas had eaten up all the strawberries, his father said to him, "My dear son, if you picked up that horseshoe, you would have your own strawberries __10__. Always remember the lesson: If you don't worry about the little things, you'll find it difficult to do the great things." | ||||
|