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【单选题】
孕妇, 28岁,G 1 P 0 , 39妊娠,骨盆外测量:髂前上棘间径23cm,髂嵴间径25cm,骶耻外径19cm,坐骨棘间径为8.5 cm,坐骨结节间径7cm,应诊断为A.
漏斗型骨盆
B.
扁平型骨盆
C.
正常骨盆
D.
均小骨盆
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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。
【单选题】Refer to Exhibit 12-2. When the market price equals $54, the firm:
A.
ould continue operating temporarily despite an economic loss because the firm is able to cover a portion of its fixed costs.
B.
should shut down.
C.
should continue operating temporarily despite an economic loss because the firm is able to cover all of its variable costs.
D.
should continue operating temporarily despite an economic loss because the firm is able to cover a portion of its fixed costs.
E.
should continue operating because the firm is making a profit.
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