单项选择题

Questions 11 to 18 are based on the conversation you have just heard

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单项选择题
Producing a thermogram is ______.
A．expensive because of the high voltage the machine requires
B．a time-consuming process
C．inexpensive after the machine is purchased
D．an unsafe procedure
单项选择题
What does the thermography depend on
A．Television cameras
B．Photograph negatives
C．Infrared energy
D．Given temperatures
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