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【单选题】
近20年来，在细胞融合和染色体技术的基础上建立了一种“早熟染色体凝集”技术。研究发现，处于细胞分裂期的细胞内含有的促进染色质凝集的物质——有丝分裂因子，能诱导分裂间期的细胞染色质提前凝集成染色体。利用这一技术，可以在光学显微镜下直接观察间期细胞中染色质结构的动态变化。下列说法正确的是 ①该实验需要通过细胞培养获得细胞分裂期和分裂间期的细胞 ②培养动物细胞时，培养液中需加入动物血清 ③收集动物细胞时，需要采用胰蛋白酶溶液处理 ④培养分裂期细胞的培养液中需加入一定浓度的秋水仙素 [     ]
A.
①②③
B.
②③④
C.
①②④
D.
①③④
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【判断题】实际气体在低温、高压的条件下最接近理想气体。 ( )
A.
正确
B.
错误
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【单选题】Each of the following statements can be used as the answer to the questiones listed below. Please pair the answers with the questions. 1.He decided to consult an acting coach to help him to learn to c...
A.
Why are CEOs so intensely lonely?
B.
What makes a good international CEO according to Mervyn Davies?
C.
What strategies for coping have CEOs come up with?
D.
Why did one CEO take on an acting coach?
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【单选题】It was in the small house was built with stones he spent his childhood.
A.
which; that
B.
that; which
C.
which; which
D.
that; where
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【简答题】Fill in each of the blanks in the following sentences with a word from the box. C hange the form where necessary. physician subtract connection authority specifically demand resume familiarize label d...
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【单选题】消费者购买那些使用时间较长和更换周期较长的商品，叫做( )。
A.
日用品
B.
特殊品
C.
耐用品
D.
非耐用品
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【单选题】It was in the small house ________ was destroyed by the flood ________ he spent his childhood.
A.
which; that
B.
that; where
C.
which; where
D.
that; which
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【判断题】实际气体在低温、高压的条件下最接近理想气体。( )
A.
正确
B.
错误
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【多选题】网络客户服务的优势有()。多 P253
A.
提供更高层次的服务
B.
降低客户服务的成本
C.
提高客户服务的效率
D.
客户寻求服务的主动性增强
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【简答题】It was in the small house ___was built with stones by his father ___ he spent his childhood. A. which; that      B, that ;where          C, which; which    D. that; which
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【单选题】设置外键约束时,以下说法错误的是:
A.
外键来源表须有主键，并且，两个字段的类型、长度必须完全一致
B.
外键引用SQL语句中表达“引用”概念的是：REFERENCES
C.
外键表达的其实是分别来源于不同表的两个字段之间的一种约束关系
D.
外键约束只能用命令删除
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相关题目：
【判断题】实际气体在低温、高压的条件下最接近理想气体。 ( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】Each of the following statements can be used as the answer to the questiones listed below. Please pair the answers with the questions. 1.He decided to consult an acting coach to help him to learn to c...
A.
Why are CEOs so intensely lonely?
B.
What makes a good international CEO according to Mervyn Davies?
C.
What strategies for coping have CEOs come up with?
D.
Why did one CEO take on an acting coach?
查看完整题目与答案
【单选题】It was in the small house was built with stones he spent his childhood.
A.
which; that
B.
that; which
C.
which; which
D.
that; where
查看完整题目与答案
【简答题】Fill in each of the blanks in the following sentences with a word from the box. C hange the form where necessary. physician subtract connection authority specifically demand resume familiarize label d...
查看完整题目与答案
【单选题】消费者购买那些使用时间较长和更换周期较长的商品，叫做( )。
A.
日用品
B.
特殊品
C.
耐用品
D.
非耐用品
查看完整题目与答案
【单选题】It was in the small house ________ was destroyed by the flood ________ he spent his childhood.
A.
which; that
B.
that; where
C.
which; where
D.
that; which
查看完整题目与答案
【判断题】实际气体在低温、高压的条件下最接近理想气体。( )
A.
正确
B.
错误
查看完整题目与答案
【多选题】网络客户服务的优势有()。多 P253
A.
提供更高层次的服务
B.
降低客户服务的成本
C.
提高客户服务的效率
D.
客户寻求服务的主动性增强
查看完整题目与答案
【简答题】It was in the small house ___was built with stones by his father ___ he spent his childhood. A. which; that      B, that ;where          C, which; which    D. that; which
查看完整题目与答案
【单选题】设置外键约束时,以下说法错误的是:
A.
外键来源表须有主键，并且，两个字段的类型、长度必须完全一致
B.
外键引用SQL语句中表达“引用”概念的是：REFERENCES
C.
外键表达的其实是分别来源于不同表的两个字段之间的一种约束关系
D.
外键约束只能用命令删除
查看完整题目与答案
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