单项选择题

A．False.
B．True.
C．Normal.
D．Strange.
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填空题
Only under ______ will the patent period extended when it has already terminated.
单项选择题
A．Computer classes.B．Training sessions.C．Laser printing.D．Package borrowing.
A．Computer classes.
B．Training sessions.
C．Laser printing.
D．Package borrowing.
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