单项选择题
当发动机机体的温度超过90℃时，冷却水： A.
全部进行小循环 B.
全部进行大循环 C.
大、小循环同时进行 D.
不一定
当发动机机体的温度超过90℃时，冷却水： A.
全部进行小循环 B.
全部进行大循环 C.
大、小循环同时进行 D.
不一定
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