单项选择题
A.go down by the head
B.list to starboard
C.trim by the stem
D.list to port
单项选择题 In cleaning up an oil spill, the use of chemical agents would （）.
单项选择题 Why is it necessary to warn engine room personnel before activating the fixed CO2 system?（）
单项选择题 The lowest temperature at which a liquid gives off enough vapor to ignite in the presence of an ignition source is called its （）.