Heavy fuel oils when spilled are（）.
A. more harmful to sea life than lighter oils
B. easier to clean up than lighter refined oils
C. less harmful to sea life than lighter oils
D. not a real threat to marine life
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香珀、石珀是唬拍中的珍贵品种.
A. 正确
B. 错误
新开店市场调研工作应包括（）。
A. 经营环境
B. 潜在客户
C. 竞争对手
The quadrantal spheres are used to（）.
A. Remove deviation on the intercardinal headings
B. Remove deviation on the cardinal compass headings
C. Remove heeling error
D. Compensate for induced magnetism in vertical soft iro
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