单项选择题
Signaling devices which are required on inflatable liferafts include（）.
A.a rocket shoulder rifle B.an oil lantern C.red flares D.an air horn
单项选择题 Signaling devices required on inflatable liferafts include a(n) （）.
单项选择题 Prior to entering a davit-launched liferaft，you should make sure that（）.
单项选择题 Prior to boarding from a vessel，a davit-launched liferaft should be well ventilated of excess（）.
