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【单选题】
下面关于类概念的描述中,( )是错误的。A.
类是抽象数据类型的实现
B.
类是具有共同行为的若干对象的统一描述体
C.
类是创建对象的样板
D.
类就是C语言中的结构类型
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【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（）。
【简答题】PLC、DCS的中文全称和英文全称分别是什么？
【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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