方程3x=0的解是x=0.______.
根据题意把x=0代入原方程可得:
左边=3×0=0;
右边=0;
左边=右边;
所以,x=0是方程3x=0的解.
故答案为:正确.
This is the only one of the books on space ___.
A.that has been written
B.that have been written
C.which have been written
D.which has been written
同级别的火灾信号,()优先;只有在原火灾()之后,才接收新的同级别信号。