问题
单项选择题
Generally，what is used to inflate liferafts?（）.
A.non-toxic gas
B.Oxygen
C.Hydrogen
D.Helium
答案
参考答案：A
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Generally，what is used to inflate liferafts?（）.
A.non-toxic gas
B.Oxygen
C.Hydrogen
D.Helium
参考答案：A
