判断题

所有病毒的人工培养都必须在活的细胞上进行。（）
正确
错误

答案：正确

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某通风工程的风管为圆形风管，采用镀锌钢板制成，风管的直径为800mm，长度为10m，风管的工程量为（）。

A．25.12㎡
B．10m
C．12.56㎡
D．5.02m³

单项选择题

Which chunk division is proper?
A、Her decision to become a jeweler /came after stints /in journalism and music management/ in her 20s and 30.
B、Her decision /to become a jeweler /came after stints in journalism/ and music management in her 20s and 30.
C、Her decision to become /a jeweler came after stints /in journalism and music management /in her 20s and 30.
D、Her decision to become a jeweler /came after stints in journalism /and music management in her 20s and 30.