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【单选题】
目前认为仅含有蛋白质而不含有核酸的病原是( )A.
缺陷病毒
B.
朊粒
C.
类病毒
D.
拟病毒
E.
卫星病毒
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反馈参考答案：
举一反三
【单选题】In the following figure, the vertical distance between points A and C represents a tax in the market. The equilibrium price before the tax is imposed is
A.
P1.
B.
P2.
C.
P3.
D.
P4.
【单选题】When I am away_______ business, I contact my office every day by email.
A.
with
B.
of
C.
on
D.
to
【单选题】In the following figure, the vertical distance between points A and B represents a tax in the market. The imposition of the tax causes the quantity sold to
A.
increase by 1 unit.
B.
decrease by 1 unit.
C.
increase by 2 units.
D.
decrease by 2 units.
【单选题】The vertical distance between points A and B represents a tax in the market. The loss in consumer surplus by the tax is measured by the area
A.
P1P3AC.
B.
P3ABP2.
【简答题】Honeywell DCS系统的LCN节点NIM的全称（中文）是（）。
【单选题】In the following figure, the vertical distance between points A and B represents a tax in the market. The imposition of the tax causes the price paid by buyers to
A.
decrease by $2.
B.
increase by $3.
C.
decrease by $4.
D.
increase by $5.
【简答题】The vertical distance between points A and B represents a tax in the market. The loss in producer surplus caused by the tax is measured by the areaA. ABC. B. P1P3ABC. C. P1P2BC. D. P1C0.
【单选题】In the following figure, the vertical distance between points A and B represents a tax in the market. The price that sellers effectively receive after the tax is imposed is
A.
P1.
B.
P2.
C.
P3.
D.
P4.
【简答题】PLC、DCS的中文全称和英文全称分别是什么？
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