密封式包装如使用纸袋、纸塑袋等材料，应使用两层，适用于单独包装的器械。
参考答案：错
The computer was used in teaching. As a result, not only__________, but students became more interested in the lessons.
A．saved was teachers’ energy
B．was teachers’ energy saved
C．teachers’ energy was saved
D．was saved teachers’ energy
最早出现的计算机网是（ ）
A．ARPANET
B．BITNET
C．INTERNET
D．ETHERNET
