题干

读图,下列说法正确的是

A:①、④两点角速度相同

B:②点线速度比③点快

C:①点、③点都位于热带

D:②点、④点都在寒带

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答案(点此获取答案解析)

B

同类题2

阅读下列短文,根据短文内容,从短文后各题所给的A、B、C、 D四个选项中,选择最佳选项。

SCENE I

One dollar a week

The doorway of the house where Chandler has a room. He is dressed in his best clothes, ready for his evening out. He is going out as his friend, Jeff White, comes in.

WHITE         What are you doing this evening, Towers?

CHANDLER      (Smiling) Tonight I'm going to live like a man with a million dollars!

WHITE         What are you talking about? You haven't got a million dollars!

CHANDLER      How much money are you and I paid each week, Jeff?

WHITE         Eighteen dollars. Why?

CHANDLER      And how much of that eighteen dollars do you spend each week?

WHITE         All of it, of course.

CHANDLER    Well, I don't. Each week I save one dollar out of my eighteen. Then, every ten weeks, I can buy myself an evening to remember.

WHITE         What do you do?

CHANDLER   I put on my finest clothes, go to one of the best restaurants in New York, eat the most expensive food on the menu, drink the best wine, and then take a taxi home!

WHITE          (Surprising) Why?

CHANDLER     Why? Because it makes me feel wonderful to sit with some of the richest people in America, and to make them think that I'm rich, too.

WHITE          You're crazy!

CHANDLER     (Laughing) Perhaps I am!

Mrs Black comes in.

MRS BLACK      Ah, Mr Chandler. I wanted to see you.

CHANDLER      Good evening, Mrs Black. What a lovely evening!

MRS BLACK   Lovely evening perhaps, but you haven't paid me for your room this month. When am I going to get the money?

CHANDLER     Soon, Mrs. Black. Very soon.

Mrs Black looks at Chandler's clothes.

MRS BLACK      You can spend money on expensive clothes, but you can't pay for your room. Is that right?

CHANDLER    (Hurrying away) Good night, Mrs Black!

同类题5

手机已成为人们沟通交流和生活娱乐的重要工具,华为、小米等自主品牌的手机越来越受到国内外用户的青睐.

(1)手机既是一个无线电发射台,又是一个无线电____ 台,手机是利用电磁波传输____ (填“模拟”或“数字”)信号实现通讯的,通话时声音信息在空中是以____ m/s的速度传递给对方的.

(2)小红手机中有一张她站在湖边的照片,小红在水中的“倒影”清晰可见,当时的“倒影”是由于光的____  形成的,小红的“倒影”和小红本身的大小____ 填“相等”或“不等”),照片中小红的倒影部分____ (填“是”或“不是”)实际光线进入手机镜头形成的.

(3)“小米4”手机的散热材料是石墨烯晶体,石墨烯____(填“有”或“没有”)固定的熔点,用石墨烯做散热材料是因为它具有优良的 ____(填“导热”或“导电”)性能.石墨烯的比热容为1.4×103J/(kg•℃),则0.1kg的石墨烯温度升高10℃,吸收的热量是 ____  J.

(4)“华为P8”手机的电池标有“标称电压3.7V”、“电池容量 2680mA•h”的字样,“标称电压”是指手机工作时的电压,该电压对人体____ (填“属于”或“不属于”)安全电压,“电池容量”是指电池所能容纳的最大电荷量,1mA•h=1mA×1h,则1mA•h=____  A•s(安•秒),若手机通话时电流为268mA,则充满电后的手机最多可通话____ h,手机一次充满电可储存的电能为 ____ kW•h(保留两位小数).