如图所示，有一矩形区域abcd，水平边长s= $\sqrt{3}$ m，竖直边长h=1m．当该区域只存在大小为E=10N/C、方向竖直向下的匀强电场时，一比荷为 $\frac{q}{m}$ =0.1C/kg的正粒子由a点沿ab方向以速率v₀进入该区域，粒子运动轨迹恰好通过该区域的几何中心．当该区域只存在匀强磁场时，另一个比荷也为 $\frac{q}{m}$ =0.1C/kg的负粒子由c点沿cd方向以同样的速率v₀进入该区域，粒子运动轨迹也恰好通过该区域的几何中心．不计粒子的重力，则（   ）

阅读理解B
    Are friends important to you?They are really important to me．My name is Phil and I'm 13．I'm from London．I have a very good friend.His name is Max．
    Max and I have a lot ofthings in common(有共同之处):our birthdays are on the same day；we are in the same class；we both love dogs；we are both good at sports and soccer is our favorite…. We always have a good time together．
    But these days I'm not happy．Max will leave England，because his father gets a job in Shanghai．Max's family will go there．I have a lot to talk with Max．and I want to give him an album(相册)．There are a lot of our photos in it．
    Today is Monday．There are only three days before Max leaves．I will go to his home to give him the album this evening．
根据材料内容简要回答下列问题。

如图所示，水平地面上固定着一根竖直立柱，某人用绳子通过柱顶的定滑轮将100 N的货物拉住。已知人拉着绳子的一端，且该绳端与水平方向夹角为30°，则柱顶所受压力大小为(　　)

将下列地区与其所描述的景观连接

A南方地区____           ①旱地麦浪大豆香

B北方地区____           ②山清水秀稻花香

C西北地区____           ③大漠黄沙驼铃响

D青藏地区____           ④雪山青稞奶茶香

甲、乙两盏白炽灯并联在电路中，两灯都正常发光，且甲灯比乙灯亮，则（　　）