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【单选题】
消费者购买决策过程的第一阶段是( )A.
信息收集
B.
方案评估
C.
购买决策
D.
确认需要
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【简答题】声音在真空中不能传播，光在真空中的速度为______m/s，通常认为声音在空气中的速度为______m/s．
【简答题】光在真空中的传播速度为 m/s，声音在真空中的传播速度 m/s。
【简答题】电视信号通过电磁波传输，其传输速度与真空中光速相同，为 m／s。
【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
【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
【单选题】Technician A says that DOT 5 brake fluid can be added to DOT 3 brake fluid. Technician B says that it is wise to purchase brake fluid that is in metal rather than plastic containers. Which technician ...
A.
Technician A only
B.
Technician B only
C.
Both technician A and B
D.
Neither technician A nor B
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