—He's friendly and helpful.
A:What's he like?
B:How's he?
C:What's he?
D:What does he like?
现代火箭用液态氢做燃料,是因为它具有( )
人们常说:“生气是拿别人做错的事来惩罚自己。”这句话说明( )
求证:直线BE是⊙O的切线.