求< img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1528957357450baad7f2d8051487dab726db41aa25639image24.png" >( )
A
0
B
1
C

D
W
出自:延安大学经济数学(专升本)1