美的事物至少都具有如下四个特性（）、（）、（）、（）。
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Damaged bulkheads often take a permanent set which is independent of the panting or bulge caused by water pressure. To control this，you should（）.
A. install shoring so the shoring supports the damaged bulkheads without pushing on them
B. install shoring so that it pushes on the damaged bulkhead while supporting it
C. use jacks or chain falls to remove the set before installing shores
D. place sandbags by the bulkhead without installing shore
发现问题应及时处理，或及时向矿领导汇报。
A. 正确
B. 错误
集团专线中铜牌客户跨地市数据专线业务保障等级默认等级是（）级。
AAA
B. AA
C. A
D. 普通级
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