As compared to carbon dioxide，dry chemical has which advantage?（） Cleaner。 Effective on metal fires。 Greater range。 More cooling effect。
当油罐发生火灾后，燃烧时间不长，油品温度还不高的情况下，可采取“边冷却、边灭火”的方法扑救。
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。
If a fire occurs in the boiler room because of a leaking fuel line to a burner, you shut off the fuel using the（） burner valve。 root valve。 quick closing valve。 oil return valve。
电气连接器为两组动车间进行通讯信号、控制信号互联互通的装置。
As a vessel changes course to starboard，the compass card in a magnetic compass（）.
