题目内容
滴定突跃是指滴定曲线上垂直上升的那段曲线所对应的pH值范围。
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以下程序的执行结果是 【10】 。#include＜iostream.h＞class Sampleint n;public:Sample() Sample(int m) n=m; int &operator--(int)n--;return n;void disp() cout＜＜"n="＜＜n＜＜end1; ;void main()Sample s(10);(s--)++;s. disp();
Almost everyone in the world uses oil in some way. Without oil, the world will stop, so men look for it everywhere. Oilmen drill for oil in deserts, in mountains and under the sea. Quite often they find nothing, but the search for oil always goes on. Oil is very important because none of our machines can run without it. Big ships carry oil everywhere. Perhaps the oil in your motorbike or in your father’s car comes from somewhere far away. Perhaps it comes from Iraq or Venezuela. Cars and motorbikes need oil, and so do many other things. How many things can you name Oil is very important for us.
My grandfather used to have a beautiful gold pocket watch．He wore it on a fine gold chain across the front of his waistcoat，and when 1 was small he promised to leave it to me in his will．“When I’m gone，”he said，“this is going to be yours．”Unfommately that will never happen now．About three months ago，my grandfather came up to London to visit US．The first Sunday morningafter he arrived，my youngest son said he wanted to go to the park．“We’11 do better than that．”said my grandfather, "we’ll go and feed the pigeons in Trafalgar Square." So off they went. Theygot home about teatime and my grandfather was looking very upset. "My watch," he said, "it’sgone. Someone must have stolen it while we were feeding the pigeons.\ When did they get back home They got back home______
在酸碱滴定过程中，当只能看到酸色时，[HIn]/[In-]一定小于10。
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