A:die out
B:die away
C:die dow
D:die off
—How did you get the unusual stamp?
—My pen friend in France sent it to me last year.
如图所示,物体放在水平地面上,在拉力F作用下做匀速直线运动,如果重力突然消失了,以下说法正确的是( )
已知函数f(x)是定义在R上的奇函数,且f(x﹣1)为偶函数,当x∈0,1时,f(x)=x12,若函数g(x)=f(x)﹣x﹣b有三个零点,则实数b的取值集合是(以下k∈Z)( )