如图的天气系统中,能形成我国东南沿海夏秋季台风天气的是( )
A:
B:
C:
D:
已知sinθ+cosθ=23,则cos2θ+5π2的值为( )
我国特大、超大城市数量最多的地区是( )
Although bike-sharing has some problems such as disorderly parking, it remains popular in Shenzhen.