A:3
B:6
C:2
D:6
凡是违反道德的行为都是违法行为。( )
关于分子动理论和热力学定律,下列说法中正确的是( )
多项式x2+mx+5因式分解得(x+5)(x+n),则m=____ ,n=____ .
—When Mum is at home, I have to practice every day, but she is on a business trip this week.