货运站的功能主要有( )。 A．财务结算服务功能 B．中转换装服务功能 C．装卸储

点P（2012，-6）关于x轴对称点的坐标是______．

某校探究式学习研究小组，为了研究蚯蚓在粗糙面上爬得快，还是在光滑面上爬得快，他们用同一条蚯蚓在相同的外界条件刺激下，分别让它在不同的表面上爬行，为了比较蚯蚓在不同表面上爬行的快慢，必须算出蚯蚓爬行的______．为了准确测出爬行的路程，在确定蚯蚓的爬行起点和终点时，他们应该选择蚯蚓的______（填“头部”或“尾部”）作为观察对象，因蚯蚓爬行的路径是弯曲的，为了测出它爬行的路程，除了使用棉线外，还需要的测量的器材是______．

据估算，我国水力资源蕴藏量达6.8亿千瓦，居世界第一位，其主要原因是（）。

A．我国的河流特别多

B．我国的河流水流量特别大

C．我国的地形特征是西高东低，而大多数河流又是东西流向的，形成了河流的巨大落差

D．我国的河流多发源于雪山地区

There has been much speculation about the origin of baseball. In 1907 a special commission decided that the modern game was invented by Abner Doubleday in 1839. One hundred years later the National Baseball Museum was opened to honor Doubleday. Historians, however, disagree about the origin of baseball. Some say that baseball comes from bat-and-ball games of ancient times. It is a matter of record that in the 1700s English boys played a game they called "baseball". Americans have played a kind of baseball since about 1800. At first tile American game had different rules and different names in various parts of the country — "town ball". "rounders", or "one old cat". Youngsters today still play some of these simplified forms of the game.
Baseball did not receive a standard set of rules until 1845, when Alexander Cartwright organized the Knicker-bocker Baseball Club of New York City. The rules Cartwright set up for his nine-player team were widely adopted by other clubs and formed the basis of modem baseball. The game was played on a "diamond" infield with the bases 90 feet apart. The first team to score 21 runs was declared the winner. By 1858 the National Association of Baseball Players was formed with 25 amateur teams. The Cincinnati Red Stockings began to pay players in 1869.

Which of the following was NOT a predecessor of baseball

A. Rounders.



B. Town ball.
C. Cricket.



D. One old cat.

商务谈判的分歧分为（）。

A、虚假的分歧

B、人为分歧

C、真正的分歧

D、想象的分歧