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【简答题】
In October, export company A of China signed a contract with a foreign client for the export of agricultural products with the time of delivery in December. However, in July and August of the same year, the producing area suffered great draught and the exporter was unable to make delivery within the time stipulated in the contract. As a result, the exporter asked for the termination of the contract on the basis of force majeure event. 1) Is the exporter appropriate in asking for the termination? Why or why not? 2) What lessons can Company A learn from this case?
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【单选题】如图是亚热带某人工草地在不同放牧强度下牧草净光合产量(净光合产量=光合作用合成量-呼吸作用消耗量)的变化图，G 0 为不放牧，G 1 ～G 3 为放牧强度逐渐增强。下列相关叙述不正确的是 [ ]
A.
5～10月份的最适放牧强度是G 2
B.
6月份可被初级消费者利用的总能量最多
C.
为使牧草净光合产量维持在最高水平，4月份不应放牧
D.
8月份G 0 草地比G 1 草地生态系统的物质循环快
【简答题】如采用奇校验传送的数据部分为0111001，则所加校验位应为______。
【简答题】生态农业具有(1)绿色植被最大；(2)生物产量最高；(3)光合产物利用率最合理；(4)( )；(5)( )等特点。[每空1分]
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