这两幅图中一共有____个长方形,____个正方形,____个三角形,____个圆。
There was something wrong with the line. We couldn't ______ each other clearly.
下列的各点中符合东半球、北半球、低纬度三个条件的有( )
pái huái
yǎo tiǎo
kǒng bù
tūn shì
____
yàn xiàn
róng yù
jǔ sàng
lián jié
下列式子:x2+2,1a+4,3ab27,abc,﹣5x,0中,整式的个数是( )