压下率和绝对压下量是一回事，只是两种叫法。

根据短文内容及首字母提示完成单词。

     One day, a young woman said something that hurt her best friend and the friend n   1   met her after that.

She regretted it, and wanted to take the w   2   back. She asked an older woman for a   3   . The woman said,

"You need to do two things. Tonight, take your best feather pillows (羽毛枕头)and before the sun rises, you

must put a single feather on the doorstep of each house in town. After you finish, come back to me and I'll tell

you the s 

  4   one."

      At night, the younger woman went from doorstep to doorstep and didn't m   5   a single doorstep. After

she finished, she went back and said,"I've put a feather on the doorstep of each home."

      Now the older woman said,"Go back and find the feathers and put them back into your pillows. Then

everything will be as it was b   6   ."

     The younger woman cried,"You know that's i   7   ! The wind blew away each feather as soon as I put

them on the doorsteps!

     " That's true," said the older woman."Each of your words is like a feather in the wind. You can never return

them to your mouth, so remember: c   8   your words well, and use warm words when you say something."

二氧化硫是由______组成．二氧化硫是由______构成的．一个二氧化硫分子是由______构成的．

丁烯管具有较高的强度，韧性好、无毒。其长期工作水温为90℃左右，最高使用温度可达()℃。

A.95

B.100

C.110

D.120

静止的镭核发生α衰变，释放出的α粒子的动能是E₀，假定衰变时能量全部以动能形式释放出去，求衰变过程总的质量亏损。