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单选题
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
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单选题The use of sinking and dispersing chemical agents for removal of surface oil is（）.A
the most common methodB
too expensive for common useC
generally safe to sea lifeD
authorized only with prior approval of the governmental On-Scene Coordinator
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