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【多选题】
减数分裂造成遗传多样性的原因A.
非姐妹染色单体交换
B.
非同源染色体自由组合
C.
形成的配子随机结合授精
D.
同源染色体自由组合
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反馈参考答案：
举一反三
【简答题】3-23、NO2的Saltzman法测定原理
【多选题】When designing a system, we need to state the threat model,in another word,we need to
A.
Set of threats we are undertaking to defend against
B.
How about our cost, time and energy？
C.
Whom do we want to prevent from doing what?
D.
What is the purpose of the attacker
【单选题】Clean-up Day is only two weeks from n ow. We need to a plan. [ ]
A.
catch up with
B.
come up with
C.
keep up with
D.
make up with
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