关于x的方程(a-1)x=2(a-1)的解是x=2.______.
a-1=0即a=1时,方程解为任意数,
a-1≠0即a≠1时,方程解为x=2.
故答案为:×.
下图为某绿色植物的逐渐变黄最后脱落的叶片中两种矿质元素含量的变化曲线,下列判断中与图解相符的是
A.a为Mg元素,b为K元素
B.a为Ca元素,b为Fe元素
C.a为Fe元素,b为Mg元素
D.a为N元素,b为Ca元素
John received an invitation to dinner, and with his work ____, he gladly accepted it.
A.finished
B.finishing
C.having finished
D.was finished