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The bird, however hard the frost may be, flies briskly to his customary roosting-place, and, with beak tucked into his wing, falls asleep. He has no apprehensions; only the hot blood grows colder and colder, the pulse feebler as he sleeps, and at midnight, or in the early morning, he drops from his perch—dead. Yesterday he lived and moved, responsive to a thousand external influences, reflecting earth and sky in his small brilliant brain as in a looking-glass; also he had a various language, the inherited knowledge of his race, and the faculty of flight, by means of which he could shoot, meteor-like, across the sky, and pass swiftly from place to place; and with it he was able to drop himself plumb down from the tallest tree-lop, or out of the void air, on to a slender spray, and scarcely cause its leaves to tremble. Now, on this morning, he lies stiff and motionless; so easy and swift is the passage from life to death in wild nature! But he was never miserable.
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参考答案:
举一反三
【单选题】若安全边际率为20%,正常销售量为1000件,则保本点销售量为( )。
A.
200
B.
800
C.
600
D.
400
【单选题】下述哪一种内分泌激素不是肾脏分泌产生的
A.
肾素
B.
前列腺素
C.
醛固酮
D.
红细胞生成素
E.
1,25(OH)2 VitD3
【单选题】在自动安平水准仪上只有()。
A.
圆水准器与管水准器精度相同
B.
圆水准器比管水准器精度低
C.
没有圆水准器
D.
没有管水准器
【单选题】若安全边际率为20%,正常销售量为l000件,则盈亏临界点销售量为件。
A.
200
B.
800
C.
600
D.
400
【简答题】甜瓜生产上为什么选留子蔓第 2 节及以后雌花或孙蔓雌花留瓜?怎样选留?
【单选题】下述哪一种内分泌激素 不是 肾脏分泌产生的?
A.
肾素
B.
前列腺素
C.
醛固酮
D.
红细胞生成素
【单选题】在自动安平水准仪上()。
A.
圆水准器与管水准器精度相同
B.
没有圆水准器
C.
没有管水准器
D.
圆水准器比管水准器精度低
【单选题】下述哪一种内分泌激素不是肾脏分泌产生的?
A.
肾素
B.
前列腺素
C.
醛固酮
D.
红细胞生成素
E.
1,25(OH)2D
【单选题】下述哪一种内分泌激素不是肾脏分泌产生的
A.
肾素
B.
前列腺素
C.
醛固酮
D.
红细胞生成素
E.
1,25 (OH)2 D3
【简答题】若安全边际率为20%,正常销售量为1000件,则盈亏临界点销售量为()件A. 200 B. 800 C. 600 D. 400
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