A:isn't have to
B:don't have to
C:doesn't have to
D:have to
a = 3
b = - 5
c = 8
a = b
b = c
c = a
PRINT a, b, c
END
下列划线字的注音,有误的一项是( )
某彩金是在黄金中加入铜、银等熔炼而成的合金,常用于制造首饰.从材料分类的角度看,彩金属于( )