The use of sinking and dispersing chemical agents for removal of surface oil is（）.<br>A:the most common method used in the United States<br>B:too expensive for common use<br>C:generally safe to sea life<br>D:authorized only with prior approval of the Federal On-Scene Coordinator

The use of sinking and dispersing chemical agents for removal of surface oil is（）.
A:the most common method used in the United States
B:too expensive for common use
C:generally safe to sea life
D:authorized only with prior approval of the Federal On-Scene Coordinator

出自：海船船员证

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