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畜牧业合同签订的原则（）、（）、（）、（）、（）。
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Passage " Arms and the clarion for the battle, but the song of thanksgiving to the victory! " answered the liberated David. " Friend, " he added, thrusting forth his lean, delicate hand forwards Hawkeye, in kindness, while his eyes twinkled and grew moist, "I thank thee the hairs of my head still grow where they were first rooted by Providence for, though those of other men may be more glossy and curling, I have ever found mine own well suited to the brain they shelter. That I did not join myself to the battle, was less owing to disinclination, than to the bonds of the heathen. Valiant and skilful hast thou proved thyself in the conflict, and I hereby thank thee, before proceeding to discharge other and more important duties, because thou hast proved thyself well worthy of a Christian s praise. Questions:This novel was written by the first American novelist. What is his name?
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当用开孔平台代替强胸横梁和舷侧纵桁时，每一开孔平台的开孔面积应不小于总面积的（）。
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根据C-D函数的设定，持续添加可变要素会导致总产量的递增
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人体对X线的吸收按照骨、肌肉、脂肪、空气的顺序而变小，所以在这些组织之间产生X线对比度。而在消化道、泌尿系统、生殖系统、血管等器官内不产生X线对比度，无法摄出X线影像，但可以在这些器官内注入原子序数不同或者密度不同的物质，即可形成X线对比度。下列叙述正确的是（）
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以下哪项不是心脏收缩功能的主要决定因素（）
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《中国共产党党章》明确规定，中国共产党领导（）。
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一次系统图的识图方法：一般由出线开始到母线再到变压器。
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气路系统进气部分的漏失，会出现离合器（）的故障。
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煤层观测的内容主要包括哪几个方面？