The students in our school each an English dictionary.
A.have
B.has
C.had
D.are having
A
执行语句Print Format(1234.567,”##,##0.00”)后,输出结果是______。
A.1234.57
B.12,34.57
C.1,234.567
D.1,234.56
设线性方程组
与方程 x1+2x2+x3=a-1 (2) 有公共解,求a的值及所有公共解.