题目内容

Imagine your friend has recently had her home destroyed by a forest fire. She is currently living in a homeless shelter, with hundreds of other people from her town. Follow the prompts below to write a letter of consolation.Dear Elena,I was so sorry to hear about ______________________________. There have been a lot of news reports about the fire on the TV news and I can see that ______________________________. I hope that ______________________________.I just wanted to write and check that ______________________________. I am really sorry to think about ______________________________. Please let me know if ______________________________.My college is ______________________________. I hope that this ______________________________.With ___________,Martha

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安装飞轮不能达到调节机械非周期性速度波动目的的原因是

A. 飞轮的作用只是“吸收”能量
B. 飞轮的作用只是“释放”能量
C. 它既不能创造出能量,也不能消耗能量
D. 飞轮的作用只是“吸收”和“释放”能量

飞轮应优先安装在机器系统的高速/低速)轴上。

可用来表征机器周期性速度波动程度的主要参数是

调节周期性速度波动的一个主要方法是在机器上安装()。

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