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【简答题】
孵化厂根据孵化设备的不同,方案主要有变温孵化和恒温孵化两种,请问巷道式孵化机的方案是( )、大箱体的方案是( )、小箱体的方案是( )。
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反馈参考答案：
举一反三
【单选题】A person pulls a box along the ground at a constant speed. If we consider Earth and the box as our system, what can we say about the net external force on the system?
A.
It is zero because the system is isolated.
B.
It is nonzero because the system is not isolated.
C.
It is zero even though the system is not isolated.
D.
It is nonzero even though the system is isolated.
E.
none of the above
【单选题】What is the first thing you should consider when thinking about building an international information system?
A.
the state of world politics
B.
look for new technologies that will help you achieve your goals
C.
consider the global environment where your business will operate, and identify the business drivers for your firm and industry
D.
the business challenges you face in the global environment
E.
the different computing and communication standards in the world
【单选题】Consider a system excited by a periodically changing external load. Which one of the following is true?
A.
The amplitude of the displacement response can be reduced if the mass becomes smaller.
B.
The response becomes larger if the excitation frequency is increased.
C.
Severe vibration takes place as the excitation frequency comes close to one of the system’s natural frequencies.
D.
There is nothing one can do to turn down the vibration scale because it is a random function of time.
【简答题】为什么我会为母亲卖白菜的决定而哭?
【单选题】下列说法不正确的是：
A.
在动、植物细胞中，遗传物质的载体是DNA
B.
细胞癌变，与细胞内遗传因素有关，许多致癌物质，它改变了细胞核内的物质
C.
动物细胞和植物细胞都有细胞膜、细胞质、细胞核
D.
DNA、基因、染色体的关系是
【多选题】为什么“我”会为母亲卖白菜的决定而哭?
A.
因为那三棵白菜原是准备留着过年包饺子的，在那个极端贫困的家庭，这是一个小孩子最大的盼望。
B.
因为我不想和母亲去集市上卖白菜。
C.
因为母亲没有和我商量就做了这个决定。
D.
因为这些白菜是我和母亲亲手种植、侍弄的，我对这些白菜有着深厚的感情。
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