单项选择题

What is the first stage of quality control（）

A．Visiting our suppliers.
B．During production.
C．Chemical analysis.

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During the trial period, the customer pays a reduced amount to rent the machine.（）

A. Right
B. Wrong
C. Doesn’t say
单项选择题
How many bytes of information can Tapestore store（）

A．500 million
B．4.5 billion
C．480,000
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