简述机械分异作用。

________you've got a chance,  you might as well make full use of it.[ ]

A. For  

B. Because

C. Even though  

D. Now that

有以下程序 #include ＜stdio.h＞ main() { FILE *fp; int’ a[10]={1,2,3,0,0},i; fp = fopen("d2.dat", "wb"); fwrite(a, sizeof(int), 5, fp); fwrite(a, sizeof(int), 5, fp); fclose(fp); fp = fopenCd2.dat", "rb"); fread(a, sizeof(int), 10, fp); fclose(fp); for (i=0; i＜10; i++) printf("%d,", a[i]); }

A．1,2,3,0,0,0,0,0,0,0,

B．1,2,3,1,2,3,0,0,0,0,

C．123,0,0,0,0,123,0,0,0,0,

D．1,2,3,0,0,1,2,3,0,0,

有3户人家共订了10份日报，每户人家至少2份，最多4份。问：一共有多少种不同的订法（）

A．6

B．12

C．18

D．21

和传统的调整法相比，零基预算有哪些特点？

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