现在当发动机起动时，关闭的热控制阀引导热废气。

Now, when the engine is started, the hot exhaust gases are deflected by the closed heat-control valve.

youdao

现在当发动机起动时，关闭的热控制阀引导热废气。

Now, when the engine is started, the hot exhaust gases are deflected by the closed heat-control valve.

youdao