单选题When preparing an engine for water temperature（）Ashould be kept at a proper level by a coolerBshould be raised to about 80℃ by a heaterCshould be raised graduallyDshould be lowered to about 60℃
单选题
When preparing an engine for water temperature（）
A
should be kept at a proper level by a cooler
B
should be raised to about 80℃ by a heater
C
should be raised gradually
D
should be lowered to about 60℃
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