重79N的正方体铁块静止在1m2的水平桌面中央，求桌面受到的压强为_爱下问搜题

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问题填空题

重79N的正方体铁块静止在1m²的水平桌面中央，求桌面受到的压强为_________．

答案

7900Pa

填空题

读一读，补全短文。

ate sat liked had watched went excited

     Last week, I had  my first trip on an airplane. It was fun! I 1.         next
to the window. I saw houses, parks, and swimming pools on the ground.
They were all very small! I 2.         the food on the airplane. I 3.          chicken,
rice, icecream and a candy bar.  I drank orange juice. I 4.         TV too.
I 5.         it a lot.  My aunt met me at the airport and we got home very late.
I was very 6.         and I had a dream that night.  In my dream I 7.         on a
trip again.

问答题简答题

计量技术法规分哪几类？