四边形有四条直的边.______(判断对错)
四边形有四条直的边,说法正确,
故答案为:√.
Sarah felt like when she found out that she had been chatting online with a boy student of her same class.
A.cry
B.to cry
C.being crying
D.crying
Eisenmenger综合征()。
A.肺性发绀
B.心性混合性发绀
C.淤血性发绀
D.缺血性发绀
E.混合性发绀