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【简答题】
引起咯血最常见的病因是 （ ）
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【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HIV的描述错误的是（ ）
A.
血清学分型有HIV-1和HIV-2
B.
HW-2是艾滋病的主要流行型
C.
HIV由单链RNA、逆转录酶和结构蛋白组成
D.
HIV比肝炎病毒对外界抵抗力低
【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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