在二项式 ${\left(\sqrt{x}+\frac{1}{2\sqrt{x}}\right)}^n$ 的展开式中，第三项系数为n﹣1，求展开式中系数最大的项．

根据对短文的理解及括号里的单词提示，用其适当形式填空。    Last Friday, a storm swept through two villages in the New Territories, destroying fourteen homes. Seven others ____ (be) so badly damages(破坏) that their owners had to leave them, and fifteen others had ____ (break) windows and fallen roofs. One person was killed, several ____ (hurt) seriously and were taken to hospital, and a number of other people got smaller hurt. Altogether over two hundred people were homeless after the storm.
    A farmer said that the storm began early in the morning and lasted ____ over an hour. "At that time, I ____ (eat) with my wife and children," he said. "When we heard a loud noise, our house fell down into pieces all of a ____ (suddenly), which was like a dream. We tried our best ____ (climb) out but then I found that one of my children missing. I went back inside and found him, safe ____ very frightened. " " I had no tome to take anything," a woman said. "A few ____ (minute) later, the roof came down."
    Soldiers helped to take people out of the flooded(水淹的) area and brought ____ (they) food, clothes and shelter.

反应3Fe(s)+4H₂O(g)  Fe₃O₄+4H₂(g)在一可变的密闭容器中进行，下列条件的改变对其反应速率几乎无影响的是 

下列关于红细胞的叙述，不正确的是（  ）

工人用如图所示的滑轮组匀速打捞沉在水中体积是3×10^﹣2m³的铝块．在匀速打捞过程中，被打捞的铝块露出水面前与完全出水后工人对绳的拉力之比为2：3，不计摩擦、绳重及水的阻力，已知铝的密度为2.7×10³kg/m³，g取10N/kg．求：