Since accumulations of H2S gas on a ship can be dangerous to personnel，it is important to know that H2S gas is（）. A:lighter than air B:heavier than air C:a yellow gas that is easily recognized D:mildly toxic

Since accumulations of H₂S gas on a ship can be dangerous to personnel，it is important to know that H₂S gas is（）.
A:lighter than air
B:heavier than air
C:a yellow gas that is easily recognized
D:mildly toxic

出自：海船船员证

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