下列说法错误的是( )
A:平行于x轴的直线上的所有点的纵坐标相同
B:平行于y轴的直线上的所有点的横坐标相同
C:若点P(a,b)在x轴上,则a=0
D:(-3,4)与(4,-3)表示两个不同的点
读一读,判断句子正误。
Hello, I'm David. I'm ten. I'm fromShenzhen. I'm short and fat. I have a big head and a big body. I have two smalleyes and a big mouth. I have two long arms and two short legs. My feet aresmall. My hands are small too. What about you?
下列说法有错误的一项是( )
有100颗种子,发芽率为90%,则有90颗种子发芽
读“我国西气东输工程示意图”,回答下列问题.