A:直角坐标系中横、纵坐标相等的点能够组成一个集合
B:π∈{x|x<3,x∈R}
C:∅={0}
D:{(1,2)}⊆{1,2,3}
阅读短文,回答问题。
I'm David. I'm an English boy. Now I'm in Wuhan. It's very hot and sunny here. I wear my new cap and T-shirt. But my shoes are old and small. I think I'll get a new pair of shoes on my birthday.
dài
pèi
yán
sònɡ
cuò
爱____
____带
屋____
传____
____施
某同学利用如图(a)装置做“探究弹力和弹簧伸长量的关系”的实验中,
函数fx=Asinωx+φA>0,ω>0,φ<π2的图象如图所示,为得到函数gx=sinωx的图象,可将f(x)的图象( )