Dear Sally,

    Thank you for your e-mail and the photo of New York. Here are some photos of my family trip in Wuhan. In the first photo, my sister Jane is wearing Chinese traditional clothes on the Yellow Grower. In the second picture, my father and I are swimming in a river. It's so cool! In the next picture, my parents, Jane and I are eating great noodles. Its name is hot dry noodles. It looks very nice!

    In the last picture, my family people are at my friend's home. We are having some mooncakes because it's the Mid-autumn Festival. It's an important festival in China. On this day, all the families get together and have a happy dinner.

    I think Wuhan is a nice city in China. The people there are friendly. One day I wish to go there again.

Yours,

David

针对“五一”节点，中央纪委监察部网站开通纠正“四风”监督举报直通车，引导网友晒出各种公款吃喝、公款旅游等“四风”问题。这一做法

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 ①有利于国家机关及其工作人员勤政廉洁     ②有利于政府取信于民，国家长治久安

 ③扩大了公民的政治经济权利                         ④有利于提高公民的民主监督意识

“欧洲从希腊继承了什么？继承了关于人和社会的某种概念的动力线。”这里所说的“关于人和社会的某种概念的动力线”是指古希腊的

某兴趣小组设计了如图甲所示的汽车转向指示灯电路模型，接通相应指示灯后，该指示灯会亮、暗（微弱发光）交替闪烁发光，电路中电源电压恒为6伏，指示灯规格为“6V 3W”，R₀为定值电阻，电磁铁线圈及铁的阻值忽略不计。

（1）若让左转、右转指示灯同时工作，转向开关应与触点　3和4　接通。（选填“1和2”、“2和3”、“3和4”或“4和5”）

（2）当转向开关与触点“2和3”接通时，右转指示灯两端实际电压变化规律如图乙所示。已知当右转指示灯微弱发光时，其两端实际电压为U，消耗的实际功率为额定功率的$\frac{1}{25}$

求：①右转指示灯闪烁交替工作30秒消耗的电能；

   ②定值电阻R₀的阻值（指示灯的电阻不变）。