我国环境保护法对人的效力范围实行以属人主义为基础，把属地主义、属人主义、保护主义三者结合起来的原则
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You see a vessel displaying three lights in a vertical line.The highest and lowest lights are red and the middle light is white.She is also showing a white light at the stern，which is lower than the forward light.It could be a（）.
A. Survey vessel
B. Vessel not under command
C. Vessel aground
D. Pilot vessel with port side to you
经皮肾镜取石或碎石术（）
A. 输尿管结石
B. 膀胱结石
C. 尿道结石
D. 肾结石
E. 纯尿酸结石
可见光频段内分布特点是（）
A. 不均匀
B. 均匀
C. 没特点
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