按题目要求作图:
(1)如图1所示,根据小磁针静止时的指向在图示中标出通电螺线管的N、S极和电流方向.
(2)如图2所示,作出平面镜前物体AB在镜中所成的像A′B′.
(1)
(2)
______ by many well-known experts and film stars, the product was very popular at one time.
A.To advocate
B.Having advocated
C.Advocating
D.Advocated
函数f(2x+1)=x2-2x,则f(3)=( )
A.-1
B.0
C.1
D.3