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单选题
What are customers told to do?
A
Read the warranty carefully
B
Clean the machine with gentle chemicals
C
Refrain from closing the machine by hand
D
Dry the machine after cleaning
参考答案
参考解析
解析：
在指南的第三条中提到开关机时用eject button，“Handling the machine manually may cause damage to the components”，可知手动开关机对机器有损害。C项正确。
在指南的第三条中提到开关机时用eject button，“Handling the machine manually may cause damage to the components”，可知手动开关机对机器有损害。C项正确。
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