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【单选题】
细胞有丝分裂过程中,发生在分裂期间的有A.
两个姐妹染色单体形成了两个染色体
B.
染色质变成了染色体
C.
每个细胞中DNA分子量增加了一倍
D.
每个细胞染色体数增加了一倍
E.
染色体、DNA都没发生明显变化
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举一反三
【单选题】Marginal revenue is equal to
A.
total revenue divided by price.
B.
the change in total revenue divided by total output.
C.
the change in total revenue divided by the change in quantity sold.
D.
price divided by quantity sold.
【单选题】Total surplus with a tax is equal to
A.
consumer surplus and producer surplus.
B.
consumer surplus minus producer surplus.
C.
consumer surplus, producer surplus, and total surplus.
D.
consumer surplus, producer surplus, and tax revenue.
【简答题】稳定蛋白质胶体的因素是____和水化膜。
【简答题】婴儿通过哺乳可获得的Ig 是 ;
【简答题】只有当保存按钮被点击时才传递meal,若要确定何时发生此情况,需要将保存按钮添加为____:
【单选题】Total surplus in a market is
A.
the total cost to sellers of providing the good minus the total value of the good to buyers.
B.
the total value of the good to buyers minus the cost to sellers of providing the good.
C.
the difference between consumer surplus and sellers’ cost.
D.
always smaller than producer surplus.
【单选题】Total surplus is defined as
A.
consumer surplus + producer surplus.
B.
consumer surplus - producer surplus.
C.
another word for profit.
D.
another word for total revenue.
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