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问题 单项选择题

调运种子、苗木和其他繁殖材料时（）

A、本省内不必办理植物检疫手续

B、非疫区办不办植物检疫手续均可

C、应当办理植物检疫手续

D、列入应施检疫的植物、植物产品名单的，必须经过检疫，未列入的，不用检疫

答案

参考答案：C

单项选择题

利用风洞吹风实验可以得到飞机气动参数，其基本依据是（）

A.连续性假设

B.相对性原理

C.牛顿三大定律

D.理想流体假设
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单项选择题

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.
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