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【判断题】
每次用吸管转移溶液后的残留量稍有不同，这样引起的误差为偶然误差。A.
正确
B.
错误
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举一反三
【单选题】Matt lives on popcorn and seafood salads. The price of popcorn is 1 dollar per bag and the price of seafood salads is 2 dollars each. Matt allows himself to spend no more than 13 dollars a day on food...
A.
he can consume up to 3 bags of popcorn per day, but no more.
B.
he can consume up to 1 bags of popcorn per day, but no more.
C.
he can consume up to 5 seafood salads per day, but no more.
D.
he can consume up to 4 bags of popcorn per day, but no more
【单选题】Suppose Sam plans to buy only popcorn and soda. He has $40 to spend per week. A change in which of the following variables will change Sam's consumption possibilities? I. price of popcorn II. income...
A.
II only
B.
I and II
C.
I, II and III
D.
III and IV
【单选题】关于逆转录描述错误的是 A. 作用物为四种 dNTP B. 催化 RNA 的水解反应 C. 合成方向 3ˊ→5ˊ D. 催化以 RNA 为模板进行 DNA 合成 E. 可形成 DNA-RNA 杂交体中间产物
A.
作用物为四种dNTP
B.
催化RNA的水解反应
C.
合成方向3ˊ→5ˊ
D.
催化以RNA为模板进行DNA合成
E.
可形成DNA-RNA杂交体中间产物
【单选题】Mario sees popcorn and pretzels as perfect substitutes. He is always willing to substitute 3 cups of popcorn for 1 cup of pretzels. If Mario consumes only popcorn, then we know that the relative price...
A.
. less than 0.33.
B.
. greater than 0.33.
C.
. between 0.33 and 3.
D.
. greater than 3.
【单选题】Which of the following shifts the supply curve of popcorn leftward?
A.
a decrease in the price of popcorn
B.
an increase in the price of popcorn
C.
a technological development in the production of popcorn
D.
a decrease in the number of popcorn suppliers
E.
a decrease in the cost of producing popcorn
【多选题】有关逆转录病毒载体描述错误的是（）。
A.
可以容纳7kb以外的外源基因
B.
是一种没有危险性的基因治疗载体
C.
可以高效整合
D.
不整合
E.
有利于让外源基因在靶细胞中永久表达
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