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【单选题】
下列哪一项不是动物细胞有丝分裂和减数分裂过程中均可发生的变化（）
A.
中心体发出星射线，形成纺锤体
B.
非同源染色体之间发生自由组合
C.
外界不利因素可导致染色体变异
D.
存在染色体数目、染色单体数目、核DNA分子数目之比为1∶2∶2的时期
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【单选题】The lions in the Gir Forest are especially vulnerable to disease because______.
A.
they have descended from a dozen or so ancestors
B.
they are smaller than the African lions
C.
they do not have enough to eat
D.
they are physically weaker than the African lions
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【简答题】CIF Liner terms
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【单选题】CFR liner terms就是由卖方支付装卸费用(    )。
A.
正确    
B.
错误
查看完整题目与答案
【简答题】CFR Liner Terms
查看完整题目与答案
【单选题】The lions in the Gir Forest are especially vulnerable to disease because they______.
A.
have descended from a dozen or so ancestors
B.
are smaller than the African lions
C.
do not have enough to eat
D.
are physically weaker than the African lions
查看完整题目与答案
【判断题】Text B后判断题 2.All girls have better vocabularies than boys.
A.
正确
B.
错误
查看完整题目与答案
【判断题】英语的词句大都用意义结合,无明确的连接成分,常组成并列的散句或分立的短句。
A.
正确
B.
错误
查看完整题目与答案
【单选题】The gir is smart and clever; __________.
A.
so is her brother
B.
so does her brother
C.
so his brother does
D.
so his brother is
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【简答题】数据传输过程出现错误如何发现?发现后如何处理?
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【简答题】发送的数据为1010001101,6位生成多项式为110101,则发送端在数据位后面补齐5位0,即101000110100000,然后用生成多项式整除得到5位余数为01110,然后将余数作为校验码附加到数据位的后面得到101000110101110,发给接收端,如果传输中间无错误,接收端用同样的生成多项式,整除接收到数据和校验码的余数为0,说明接收数据正确。假定数据帧101000110101110...
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相关题目：
【单选题】The lions in the Gir Forest are especially vulnerable to disease because______.
A.
they have descended from a dozen or so ancestors
B.
they are smaller than the African lions
C.
they do not have enough to eat
D.
they are physically weaker than the African lions
查看完整题目与答案
【简答题】CIF Liner terms
查看完整题目与答案
【单选题】CFR liner terms就是由卖方支付装卸费用(    )。
A.
正确    
B.
错误
查看完整题目与答案
【简答题】CFR Liner Terms
查看完整题目与答案
【单选题】The lions in the Gir Forest are especially vulnerable to disease because they______.
A.
have descended from a dozen or so ancestors
B.
are smaller than the African lions
C.
do not have enough to eat
D.
are physically weaker than the African lions
查看完整题目与答案
【判断题】Text B后判断题 2.All girls have better vocabularies than boys.
A.
正确
B.
错误
查看完整题目与答案
【判断题】英语的词句大都用意义结合,无明确的连接成分,常组成并列的散句或分立的短句。
A.
正确
B.
错误
查看完整题目与答案
【单选题】The gir is smart and clever; __________.
A.
so is her brother
B.
so does her brother
C.
so his brother does
D.
so his brother is
查看完整题目与答案
【简答题】数据传输过程出现错误如何发现?发现后如何处理?
查看完整题目与答案
【简答题】发送的数据为1010001101,6位生成多项式为110101,则发送端在数据位后面补齐5位0,即101000110100000,然后用生成多项式整除得到5位余数为01110,然后将余数作为校验码附加到数据位的后面得到101000110101110,发给接收端,如果传输中间无错误,接收端用同样的生成多项式,整除接收到数据和校验码的余数为0,说明接收数据正确。假定数据帧101000110101110...
查看完整题目与答案