电液转辙机油缸连续往复动作（）次后，活塞杆两端油膜不成滴.A.10 B.15 C.2

阅读理解。

     Most of us may play ping-pong, but perhaps you don't know who invented it. The story is that it started

when two students at Cambridge University began knocking a cork (软木塞) to each other across a table,

using old boxes. In about the year l,800 an American businessman of sports goods produced a game that he

called Indoor Tennis. The Americans didn't find interest in it. He shipped (海运) it to London and it soon

became popular in Britain. The game was then played across dinning room tables, or on the floor with the

net string (网) between chairs. The players used a ball made of cork or rubber. A few years later a hollow

(空的) ball like the one we use today was invented. People all over the world loved it at once. A man called

Mr Wood in London, had the idea of covering the bats (拍子) with rubber. Later a London businessman

called this game "ping-pong". "Ping" meant the sound of the bat hitting the ball, and "pong" was the sound

of the ball hitting the table.

     The game is played everywhere, but not everybody likes it. Some even think it's a silly game.

1. _______　at Cambridge University first played table tennis, using a cork and _______.

2. A game called Indoor Tennis _______ in about the year 1,800.

3. Although the American didn't like the game, _______ showed great interest in it and it became popular.

4. After hollow balls were invented, the bats _______ were invented by Mr Wood.

5. 将文中画线部分译成汉语。

    ______________________________________________________________________

下面是商品等级与中心地等级关系表和中心地市场区域图，读图表完成问题。

小题1:关于中心地等级的比较，正确的是(　　)

A．A>B<C

B．A<B<C

C．A>B>C

D．A<B>C小题2:图中甲地居民要购买4、5级商品，应去的中心地最适合的是(　　)

A．B₁

B．B₆

C．C₆

D．A

一条形磁铁用细线悬挂处于静止状态，一铜质金属环从条形磁铁的正上方由静止开始下落，如图所示，在下落过程中，下列判断中正确的是

A．在下落过程中金属环内产生电流，且电流的方向始终不变

B．在下落过程中金属环的加速度始终等于 g

C．磁铁对细线的拉力始终大于其自身的重力

D．金属环在下落过程动能的增加量小于其重力势能的减少量

国内甲公司的记账本位币为人民币。20×7年12月5日以每股4美元的价格购入A公司10000股作为交易性金融资产，当日汇率为1美元=7.6元人民币，款项已经支付，20×7年12月31日，当月购入的A公司股票市价变为每股4.2美元，当日汇率为1美元=7.4元人民币，假定不考虑相关税费的影响，根据以上资料，回答下列问题。

甲公司期末应计入当期损益的金额为()人民币。

A.6800元

B.800元

C.10000元

D.10600元

治疗慢性萎缩性胃炎通常不宜选用的药物是（）

A.甲硝唑

B.呋喃唑酮

C.胶体铋

D.洛塞克

E.吗丁啉