用一根8分米长的铁丝围成一个正方形,这个正方形的边长是______分米.
8÷4=2(分米);
答:这个正方形的边长是 2分米.
故答案为:2.
Mum, _____ my good friends, Kate and Lucy. [ ]
A. she is
B. they are
C. this is
D. these are
氧气在线分析仪一般都安装在加热炉顶附近。()