已知f(x)是一次函数,若f(0)=1,f(2x)=f(x)+x,则f(x)=( )
A:2x+1
B:x+1
C:x
D:2x
步骤I.检查装置的气密性。
步骤II.将盛有足量白磷的带孔燃烧匙伸入A瓶中,向瓶中加满80℃热水,塞紧瓶塞。
步骤III.打开K1、K2,从a口向瓶中鼓入空气,待瓶中的液面低于燃烧匙底部时,关闭K1、K2。此时量筒中水的体积为200mL。
____ He's my brother.
____ Who's that boy?
____ Yes, she is.
____ Is she your mother?
____ No, he isn't. He's my teacher.
____ Is he your father?
现代生物科技中,下列处理或操作正确的是( )