DDG-55A型酸碱浓度计由发送器和转换器两大部分组成。
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When shall the stand-on vessel in a crossing situation take action to avoid the other vessel（）.
A. When a risk of collision exists
B. When action by the give-way vessel alone will not prevent a collision
C. When the bearing to give-way vessel becomes steady
D. When the vessels become less than 1/2 mile apart
我国个人所得税有哪些特点？这些特点对税收筹划有哪些影响？
驰名商标是指在中国为相关公众广为知晓并享有较高声誉的（）。
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