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【简答题】
养鸡是农民致富的途径之一。要想让鸡多产蛋，饲料的选择很重要。当饲料的能量水平较高时，母鸡摄取到足量后就不再吃食了，这样鸡的取食物量就减少，随之吃进的蛋白质也就减少，结果会导致鸡群的产蛋率下降。怎样通过合理的选择和配制饲料，让母鸡多产蛋呢？仔细分析下面图表提供的数据，你会得到不少启发。 (1)产蛋率与取食蛋白质质量的关系是关系还是反比关系？ (2)在解读上述数据的基础上，运用这些数据解决以下问题：如果你具有能量水平11.9×10焦／千克的饲料，则饲料中蛋白质的百分比含量应是多少，才能维持鸡群的产蛋率为90%？ (3)如果你饲喂鸡群的饲料，能量水平是11.7×10焦／千克，蛋白质含量为15%，平均每只鸡每天取食量为102克，请预测该鸡群的产蛋率最高是多少？ (4)要提高鸡群的产蛋率，你还有其他更好的办法吗？
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【单选题】It was reported that an agreement ____ between the two companies and that they would carry out a project together. [     ]
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【单选题】It was reported that an agreement ____ between the two companies and that they would carry out a project together.
A.
reached
B.
had been reached
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was reached
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【单选题】Why was the passenger jet forced to land at Halifax, Canada?
A.
Some passengers would get off the plane in Canada.
B.
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refused to speak to her
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是中脑背侧面上丘和下丘的总称
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【单选题】--Did you sleep well yesterday? -- Never _____. I fell into a deep sleep the moment I went to the bed.
A.
bad
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【单选题】I can sleep for 7 hours every day now, but if I take that job, I ____less time for        sleep.
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sleep, in
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【单选题】People______ that vertical flight transports would carry millions of passengers as do the airliners of today.
A.
comprehended
B.
anticipated
C.
revealed
D.
asserted
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【单选题】What options would they offer to passengers?
A.
Hot beverages
B.
Steamed buns
C.
Light meals
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【单选题】It was reported that an agreement ____ between the two companies and that they would carry out a project together. [     ]
A.
reached
B.
had been reached
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was reached
D.
had reached
查看完整题目与答案