单项选择题

A．1.
B．2.
C．3.
D．4.
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What is the chief advantage of the virtual reality techniques when used in microsurgery
单项选择题
A．In developing countries.B．In industrial countries.C．In China.D．Both A and B.
A．In developing countries.
B．In industrial countries.
C．In China.
D．Both A and B.
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