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

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热门试题

单项选择题

What does the thermography depend on

A．Television cameras
B．Photograph negatives
C．Infrared energy
D．Given temperatures

单项选择题

What is the advantage in using thermography to detect cancer

A．It is very accurate in detecting breast cancer.
B．It can indicate very small cancers.
C．It adds to doctors' skills in treating disease.
D．It is helpful to save lives.