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Unemployed, John__________________(几乎无法维持生计).

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Henry Ford was the man who first started making cars in large (36) . He (37) didn’t know how much the car was going to (38) American culture. The car made the United States a nation on (39) . And it helped make the United States what it is today. There are three main reasons why the car became so (40) in the United States. First of all, the country is a (41) one and Americans like to move around in it. The car provides the most (42) and cheapest form of (43) . With a car people can go to any place without spending a lot of money. (44) Long-distance trains have never been as common in the United States as they are in other parts of the world. (45) . The third reason is the most important one, though. (46) Americans don’t like to wait for a bus, or a train or even a plane. They don’t tike to have to follow an exact schedule. A car gives them the freedom that Americans want most to have.

称量分析中，当沉淀从溶液中析出时，其他某些组分被被测组分的沉淀带下来而混入沉淀之中，这种现象称后沉淀现象。( )

A. 对
B. 错

下面程序输出的结果是______。 main() int i; int a[3][3]=1, 2, 3, 4, 5, 6, 7, 8, 9; for(i:0; i＜3; i++) printf("%d", a[2-i][i]);

以下程序的功能是：求出数组X中各相邻两个元素的和依次存放到a数组中，然后输出。请填空。 main() int x[10], a[9], i; for[i=0; i＜10; i++) scanf("%d", ＆x[i]); for( (9) ; i＜10; i++) a[i-1]=x[i]+ (10) ; for(i=0; i＜9; i++)printf("%d", a[i]); printf(" ");