Which method of adjusting mooring lines is_爱下问搜题

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问题单项选择题

Which method of adjusting mooring lines is MOST useful for leaving a boat free to rise and fall with the tide?（）

A.Crossing the spring lines

B.Slacking all forward running lines while keeping all after running lines taut

C.Doubling up on spring or breast lines

D.Slacking bow and stern lines

答案

参考答案：A

完形填空

I was tired and hungry after a long day of work. When I walked into the living-room, my 12-year-old son looked up at me and said, “I __ you.” I did not ___ what to say, and I just stood there, looking ____ at him. My first ____ was that he _____need help with his homework. Then I asked, “What was that all ___?”
“Nothing,” he said, “My teacher said we should tell our parents we love them and ____ what they say.”
The next day I called his teacher to __ more about what my son said and how the other parents had reacted（反应）. “Most of the fathers had the ___ response as you did,” the teacher said, ”When I first _____ that we try this, I asked the children ____ they thought their parents ____ say. Some of them thought their parents would have heart trouble.”
Then the teacher ____ , “ I want my students to know that feeling love is an important part of _____. I’m trying to tell them it’s too bad that we don’t express (表达) our feelings. A boy _____ tell his father or mother he loves him or her.” The teacher understands that sometimes it is_____ for some of us to say something that is good for us to say.
That evening when my son___ to me, I took him in my arms and held ___ for a longer moment, saying, “Hey, I love you, ____.” I don’t know if saying that made ____ of us healthier, but it did feel pretty good.

问答题

试在下面的简单情况下，由牛顿定律推导动能定理：质点在斜向上与水平方向成α角的恒力F和阻力f作用下，沿水平方向做匀加速直线运动．