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【判断题】
道岔由转辙部分、连接部分、辙叉部分三部分组成。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】Refer to Exhibit 12-9. Using Graph C, which of the following statements is not true?
A.
There has been an increase in demand in the market.
B.
There has been an increase in supply in the market.
C.
The equilibrium price in the market has increased from P0 to P1.
D.
There has been a change in quantity supplied from Q0 to Q1.
【单选题】Refer to Exhibit 12-5. At a market price of $30, total revenue is sufficient to pay:
A.
all variable costs.
B.
all variable costs and a portion of fixed costs.
C.
all costs, fixed and variable.
D.
only a portion of the variable costs.
【简答题】简述同步发电机的工作原理。
【简答题】电励磁同步发电机的工作原理?
【单选题】Refer to Exhibit 12-3. Graph C exhibits a price-taking firm:
A.
experiencing an economic loss of $120.
B.
making an economic profit of $120.
C.
making an economic profit of $720.
D.
experiencing an economic loss of $600.
【简答题】试述同步牵引发电机工作原理。
【简答题】简单描述同步发电机的工作原理。
【单选题】Refer to Exhibit 12-3. Total revenue for the firm in Graph C equals:
A.
$120.
B.
$150.
C.
$600.
D.
$720.
【简答题】简述同步发电机的工作原理。
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