单项选择题
A.quality
B.reliability
C.price fluctuating
D.applicability
单项选择题 When replacing a part with a spare one, we should fill in tile spare parts consume table in time and make a mark in brief for （）
单项选择题 Why the cooling water of the diesel engine should be treated? Because the（）
单项选择题 The cooling water of the diesel engine should be treated, because it has（）