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The equipment is slow and heavy by modern s（）.( level of quality)
The equipment is slow and heavy by modern s（）.( level of quality)
正确答案：standards
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企业对消费者的电子商务模式：Bussiness-to-Consumer (B2C)
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These black models are moving in on what was previously white t（）: the lucrative cosmetic contracts.(an area of knowledge or interest)