生奶的抑菌作用在O"C时可保持48小时，()可保持3小时。
A. 30℃
B. 20℃
C. 10℃
D. 5℃
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Late-mover advantages are handicaps experienced by being a _____________ to a market.
Entrepreneurs refers to those who first commercialize innovations.()
____________ is the basic social organization of a society.
（）是属于脱机功能。
A. 签到
B. 重打印
C. 签退
D. 消费
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