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【单选题】
The zero-profit price for a firm in perfect competition:A.
is a price just sufficient to cover fixed cost.
B.
is at the point where total revenue from sales is at its minimum level.
C.
occurs at the point where marginal and average cost are equal.
D.
occurs at the point where marginal cost is at its minimum level.
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举一反三
【单选题】Among the uses not mentioned in the article is the use of the bandanna as a ______.
A.
sling
B.
bandage
C.
noose
D.
handkerchief
【简答题】当x=______时，14-x=0；当x=______时，x+2.8=5．
【简答题】S1:Stand by rescue sling and report.S2:Rescue sling standing by.Q:What is standing by?A. Rescue litter. B. Rescue net. C. Rescue basket. D. Rescue sling.
【单选题】What fruits are used in the Summer Sling smoothie?
A.
bananas and apples
B.
papaya and bananas
C.
pears and apples
【简答题】当x=6时，x的平方=______，2x=______；当x=______时，x的平方=2x．
【简答题】简述物联网的定义，分析物联网的“物”的条件？
【单选题】What is a sling psychrometer used to measure?
A.
Latent heat
B.
Super heat
C.
Wet and dry bulb temperature
D.
Barometric pressure
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