Fires in escaping flammable gas are quickly brought under control by（） stopping the flow of gas。 reducing the chemical chain reaction。 increasing the oxygen supply。 cooling below the autoignition point。
当动车组以15公里速度运行时，车外目的地显示器无显示。
As a vessel changes course to starboard，the compass card in a magnetic compass（）. remains aligned with compass north。 also turns to starboard。 first turns to starboard then counterclockwise to port。 turns counterclockwise to port。
质量管理学有哪些重要概念？
下列不可以做广告的药品是（） 未取得注册商标的药品。 戒毒药品。 乙肝药品。 肺结核药品。
If a fire occurs in the boiler room because of a leaking fuel line to a burner, you shut off the fuel using the（）
