如图所示的实验操作中正确的是( )
在△ABC中,∠A=90°,对应三条边分别为a、b、c,则a、b、c满足的关系为( )
—Yes. He came to study here just last month.
—Dad, I'll be in the final singing competition tomorrow.
—Be careful not to get a sore throat and your voice.