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【单选题】
In the long run, new firms will enter a perfectly competitive market when firms in the market are _______.A.
making zero economic profit
B.
increasing output in order to maximize profit
C.
incurring economic losses
D.
making positive economic profits
E.
shutting down temporarily to reduce their economic losses
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【简答题】Technician A says that pistons are usually made of an aluminum alloy. Technician B says that pistons are usually made of stainless steel. Who is correct?A. Technician A. B. Technician B. C. Both Techn...
【单选题】真空中光速为3×108 m/s,波长为380 nm的紫光,其频率为()。
A.
7.89×1014Hz
B.
1.27×106Hz
C.
3.0×108Hz
D.
1.27×1014Hz
【单选题】The technician took one day to complete the task which I planned to fulfill within a week.
A.
这位技术员花一天时间完成任务，而我却要用一周来完成。
B.
这位技术员花一周时间完成任务，而我只要一天的时间。
C.
这位技术员花一天时间完成了我原计划用一周完成的任务。
【简答题】Technician A says that airflow can be measured directly. Technician B says that airflow can be calculated. Who is correct?A. Technician A. B. Technician B. C. Both Technician A and Technician B. D. Ne...
【单选题】Technician A says that the diodes regulate the generator output voltage. Technician B says that the field current can be computer controlled. Which technician is correct? _____
A.
Technician A only
B.
Technician B only
C.
Both Technicians A and B
D.
Neither Technician A nor B
【单选题】真空中光速为3×10 8 m/s,一个透明介质的折射率为2.0,光在该介质中的速度为( )
A.
6×10 8 m/s
B.
4.5×10 8 m/s
C.
3×10 8 m/s
D.
1.5×10 8 m/s
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