单项选择题
A. To repair the machine, follow the instructions in the book.
B. Consult the book for details before using this machine.
C. If the machine develops a problem, report it in the book.
A. To repair the machine, follow the instructions in th……
A. To repair the machine, follow the instructions in the book.
B. Consult the book for details before using this machine.
C. If the machine develops a problem, report it in the book.
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