Chinese chestnuts are packed in gunny bags()50 kolograms each.
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It was found upon examination that nearly 20% of the package had been broken,obviously attributed to improper()
经过网络的建设,我国电话网形成了具有 个平面的长途电话网。
二级长途交换中心DC2一般设在 ( )
A. 北京
B. 省会城市或直辖市
C. 地级市
D. 县