问题
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
答案
参考答案：C
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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
参考答案：C