—When did your father stop smoking?
—In 1999, the year I was born.
A:put up
B:think up
C:mix up
D:give up
抛物线y=x2+bx+c与x轴交于A(1,0),B(m,0),与y轴交于C.
下列有关我国季风的叙述,正确是( )
如图所示,物体的长度是____ cm,弹簧秤的示数是____ N.
如图所示的电路中,电源电压和灯泡电阻都保持不变,闭合开关S,滑动变阻器的滑片P由中点向右移动时,下列判断正确的是( )