单项选择题

What is the main subject of the talk

A．How thermographic photography was invented.
B．The advantages of X-rays over thermography.
C．Scientific photography for diagnostic purposes.
D．Several new techniques for reducing pain.

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热门试题

单项选择题

How do thermographic pictures indicate the temperature of various parts of the body

A．With charts and graphs.
B．With a thermometer.
C．With different colors.
D．With moving lights.

单项选择题

According to the speaker, why would thermography be non-threatening to patients

A．It is not painful.
B．Patients can see the pictures.
C．The process is very relaxing.
D．No radiation is involved.