问题
写作题
书面表达。
根据图画提示以My room为题写一篇60词左右的短文。
My room
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答案
My room
This is my room. There is a big bed, a desk, a chair and a bookcase in it. There is a computer on the desk.
Some books are in the bookcase. There is a picture on the wall. My backpack is on my bed. A cat is under the
desk. My room is small, but I like it.
(答案不唯一)
Rn)发生α衰变，放出一个速度为v0、质量为m的α粒子和一个质量为M的反冲核钋(21884Po)，若氡核发生衰变时，释放的能量全部转化为α粒子和钋核的动能。
量表示)