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【单选题】
定义集合A-B={x|x∈A且x?B}，若A={1，3，5，7，9}，B={2，7，9}；则A-B=（ ）A.
{1，2，3，5}
B.
{7，9}
C.
{2}
D.
{1，3，5}
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举一反三
【单选题】Refer to Figure 1 The amount of the tax per unit is
A.
P 2 minus P 0 .
B.
P 2 minus P 1 .
C.
P 1 minus P 0 .
D.
Q 1 minus Q 0 .
【单选题】已知FTP服务器的IP地址为210.67.101.3,登录的用户名为"KITE",端口号为23,通过FTP方式登录时,以下输入正确的是( )
A.
ftp://210.67.101.3
B.
ftp://210.67.101.3：KITE
C.
ftp://210.67.101.3/KITE:23
D.
ftp://210.67.101.3：23
【单选题】Refer to Figure 9-1. With trade, Scotland will
A.
export 11 units of wool.
B.
export 5 units of wool.
C.
import 15 units of wool.
D.
import 6 units of wool.
【简答题】根据牛顿运动定律 F=ma ,物体质量 m 恒定,测得力 F 就可以计算出加速度 a ,而力可以通过测量弹性元件的形变的大小得到,所以 就是测量力的传感器 。
【单选题】Refer to Figure 1 The per-unit burden of the tax on sellers is
A.
P 2 minus P 0 .
B.
P 2 minus P 1 .
C.
P 1 minus P 0 .
D.
Q 1 minus Q 0 .
【单选题】Figure 1 The figure below depicts a production function for a firm that produces cookies. Refer to Figure 1 . As the number of workers increases,
A.
total output increases, but at a decreasing rate.
B.
marginal product increases, but at a decreasing rate.
C.
marginal product increases at an increasing rate.
D.
total output decreases.
【单选题】Refer to Figure 28-1. The labour force is
A.
134.0 million.
B.
92.3 million.
C.
139.7 million.
D.
98.0 million.
【单选题】Refer to Figure 9-1. From the figure it is apparent that
A.
Scotland will export wool if trade is allowed.
B.
Scotland will import wool if trade is allowed.
C.
Scotland has nothing to gain either by importing or exporting wool.
D.
the world price will fall if Scotland begins to allow its citizens to trade with other countries.
【单选题】Refer to the symbol in Figure1. When A = 0 and B = 1, ________.
A.
∑ = 1, Cout = 1
B.
∑ = 0, Cout = 1
C.
∑ = 0, Cout = 0
D.
∑ = 1, Cout = 0
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