污染食品的有害物质分为三大类：生物性污染物、化学性污染物和放射性污染物。
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评价服务质量的移情性是指企业站在（）立场给予其关心和个人化服务，使整个服务过程更富有“人情味”。
In a traffic separation scheme, when joining a traffic lane from the side, a vessel shall do so（）.
A. only in case of an emergency or the engage in fishing within the zone
B. as nearly as practical at right angles to the general direction of traffic flow
C. at as small an angle as possible
D. only to anchor within the zone
为了提高联合运输的效率，需要联运企业与不同的运输企业之间建立有效的（）
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