将某种材料做成的均匀长方体锯成A、B、C三个物块然后对拼在一起,放在光滑水平面上

题型:问答题

问题:

将某种材料做成的均匀长方体锯成A、B、C三个物块然后对拼在一起,放在光滑水平面上,如图所示,A、B两物块质量都是1kG.用8N的水平力F从正面推C,使A、B、C组成的长方体保持矩形的整体沿力的作用方向平动.求:

(1)运动中C对A的作用力的大小和方向;

(2)运动中B对C的静摩擦力的大小和方向;

(3)如果从力开始作用时计时,经过3s,对A、B两物体共做了多少功?

考点:动能定理
题型:问答题

回答下面问题。

1.文中引用的《汉乐府·江南》:江南可采莲,莲叶何田田,鱼戏莲叶间。鱼戏莲叶东,鱼戏莲叶西,鱼戏莲叶南,鱼戏莲叶北。

(1)背诵并默写《汉乐府·江南》。

_____________________________________________________________________

(2)这首诗是当时南诗的代表作,当时北诗的代表是____________。

(3)请再写出两句描写江南风景的诗句。

_____________________________________________________________________

2.下面是文学名著《红楼梦》中描写,读后根据审美感受,说说你最喜爱的语段并简述理由(100字左右)。

(1)望前一望,见白石崚嶒(líng céng,高峻),或如鬼怪,或如猛兽,纵横拱立,上面苔藓成斑,藤萝掩映,其中微露羊肠小径。

(2)只见佳木茏葱,奇花闪灼,一带清流,从花木深处曲折泻于石隙之下。

(3)院中点衬几块山石,一边种着数束芭蕉;那一边乃是一棵西府海棠,其势若伞,丝垂翠缕,葩吐丹砂。

(4)忽闻水声潺湲,泻出石洞,上则萝薜倒垂,下则落花浮荡。

_____________________________________________________________________

题型:问答题

()对人类本性持既善又恶的观点。

题型:问答题

电子数据交换(EDI)技术常用于顾客与零售商之间的交易单据传输。

题型:问答题

阅读理解。

     Toyota Motor Corp, Japan's biggest carmaker, said on Friday it will recall 1,489 Lexus sedans (高级轿车) sold in China. "It will take us some time to ship the fuel tanks and vent pipes to China to change

those in these Lexus sedans for customers free of charge, if problems are found," said Yang Hongjian, a

spokes- woman of Toyota's China representative office.

     The expected recall will affect Lexus LS430 sedans made in Japan from July 29, 2003 to January 14,

2004, the representative office said in a statement. Toyota has not received complaints from Chinese

customers, according to the statement. The move will be part of Toyota's global recall of 18,200 Lexus

LS430s. It will be the third car recall in China in two weeks. Although automobile recall is a common

practice in developed markets, it remains new to Chinese customers. The Chinese government published

long-awaited automobile recall rules on March 15, which will be officially carried out at the beginning of

October.

     China's auto market is forecast to reach 10 million units by 2010. Automakers, especially Chinese

producers, will face greater pressure from automobile recalls, which could be very costly sometimes, and

should be in full preparations, according to the expert. The Japanese carmaker sold 1, 549 Lexus

vehicles on the Chinese mainland during the first five months of this year, according to Yang. Lexus sales

on the mainland reached 4,000 units last year, up from 1,600 units in 2002. (China Daily July 3, 2004)

1. What can we learn from the text?

A. Chinese customers are not satisfied with Toyota Lexus LS430 sedans.

B. Chinese car market has seen car recalls three times so far.

C. Toyota will have a worldwide recall of Lexus LS430 sedans.

D. Toyota Motor start to recall Lexus Sedans due to the problems with fuel tanks.

2. The carmakers were unwilling to recall their cars in the past mainly because ______.

A. they were not fully prepared

B. they couldn't afford the cost for their car recalls

C. their products could not meet the required standard

D. there were no related rules and little pressure

3. It is implied in the passage that ______.

A. sales of homemade automobiles will grow even faster

B. automobile recalls will take place in China more frequently

C. China's car market is forecast to be the biggest by 2010 in the world

D. Toyota is likely to sell the most Lexus Sedans in China in the future

4. Which of the following is the best tide of this passage?

A. Toyota to Recall Its Lexus Sedans Sold in China

B. China Prepares to Recall Cars

C. The Problems in China's Car Market

D. Costly Japanese Car Recalls

题型:问答题

保尔·柯察金是()作品中的人物。

A.《苦难的历程》

B.《钢铁是怎样炼成的》

C.《复活》

D.《在人间》

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