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当前学科：教师职称计算机考试(综合练习)
题目：
单选
双声道声波数据的存储量是单道的（）倍
A . 4
B . 3
C . 2
D . 5
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推荐知识点:
Sixteen-year-old Maria was waiting in line at the airport in Santo Domingo. She was leaving her native country to join her sister in the United States. She spoke English very well. Though she was very happy she could go abroad, she was feeling sad at leaving her family and friends. As she was thinking all about this, she suddenly heard the airline employee asking her to pick up her luggage and put it on the scales (称). Maria pulled and pulled. The bag was too heavy and she just couldn't lift it up. The man behind her got very impatient. He, too, was waiting to check in his luggage.
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