喜马拉雅山是由以下哪组板块运动形成的( )
A:非洲板块、亚欧板块
B:美洲板块、印度洋板块
C:亚欧板块、印度洋板块
D:非洲板块、美洲板块
已知a→=4,e→为单位向量,当a→,e→的夹角为2π3时,a→+e→在a→-e→上的投影为( )
标有“2V,1W”字样的小灯泡和标有“20Ω,1A”字样的滑动变阻器,连接在如图所示的电路中,其中电源电压为6V,电流表的量程为“0~0.6A”,电压表的量程为“0~3V”。闭合开关,移动滑动变阻器滑片,电流表、电压表示数的范围是 ()
⑴Are these your shoes? ____ A. It's a T-shirt.
⑵What are these ? ____ B. They are keys.
⑶What is this? ____ C. Yes, they are.
⑷Is this your blue shirt? ____ D. It's Jenny's.
⑸Whose sweater is this?____ E. No, it's not.
向量OA→=(1,0),OB→=(1,1),O为坐标原点,动点P(x,y)满足0≤OP→·OA→≤10≤0P→·OB→≤2,则点Q(x+y,y)构成图形的面积为____ .