Lydia enjoys going to the theater to see Broadway musicals. The following demand schedule shows Lydia's willingness to pay for theater tickets in a year.
A.
cket Price Number of Tickets
B.
0 1
C.
0 2
D.
0 3
E.
0 4
F.
0 5
G.
0 6
H.
the price of tickets to Broadway musicals equals $50, Lydia's consumer surplus will be:
I.
$350.
J.
$300. K. $250. L. $100.
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【简答题】在容易自燃和自燃的煤层中掘进巷道时,对于巷道中出现的冒顶区,必须及时进行( )。 A 增加风量 B 防火处理 C 报废 D 加强支护