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问题 填空题 案例分析题

生态学家为了监测和预报该生态系统鼠害的发生情况，对弃耕后田鼠种群数量的变化规律进行了研究。

重复观察统计田鼠数量，对所建立的模型进行检验或修正，以利于（）。

答案

参考答案：鼠害防治

填空题

将一对光纤功或数字通道调至备用的时限为（）分钟，2M速率以上电路调至备用的时限为（）分钟。
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单项选择题

Partha has withdrawn its troops from Baltia after five years of occupation. Earlier this year the country of Cardena began shipping mules to Baltia’s resistance fighters to facilitate transport of weapons across Baltia’s mountains to the battle areas. Cardena’s diplomats now claim that without Cardena’s aid to Baltia’s resistance fighters, Partha would not have withdrawn.
Which of the following, if true, casts the most serious doubt on the accuracy of the assertion of Cardena’s diplomats

A．No precise figures are available concerning the number of mules shipped to Baltia.

B．During the past year, Cardena shipped weapons and food, as well as mules, to resistance fighters in Baltia.

C．Last year a new government took power in Partha and decided that national interests were not served by the occupation of Baltia.

D．Two years ago Partha had no plans to reduce its forces in Baltia.

E．(E) Resistance fighters in Baltia fought for five years against Partha’s occupying troops.
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