单项选择题

A．Less than 15 hours.
B．15 Hours on average.
C．Up to 20 hours.
D．30 hours at most.
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dominating
单项选择题
A．Keep it away from heat, drafts, and humidity.B．Keep it as empty as possible.C．Wash its interior frequently.D．Set it regularly at zero degree.
A．Keep it away from heat, drafts, and humidity.
B．Keep it as empty as possible.
C．Wash its interior frequently.
D．Set it regularly at zero degree.
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