单项选择题
A.Open the intake valve to an adjacent tank
B.Set out drip pans and sawdust and begin to mop up the spill
C.Signal the shore control point to shutdown
D.Close the valve on the tank vent line
单项选择题 For which of the listed classes of fire combinations would carbon dioxide be most suitable as the extinguishing agent （）.
单项选择题 Most lifeboats are equipped with （）.
单项选择题 While reading the station bill, you find "three (3) short blasts on the whistle and three (3) short tings on the general alarm bells," this signal is for （）.