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[单选] You are underway and pass by a lighthouse. Its light,which was white since you first sighted it,changes to red. This means().

A . the light is characterized as alternately flashing
B . the lighthouse has lost power and has switched to emergency lighting
C . it is the identifying light characteristic of the lighthouse
D . you have entered an area of shoal water or other hazard

只有经依法核准登记领取营业执照,具有从事经营活动资格的法人、其他经济组织和个人才属于反不正当竞争法所指的经营者。() 在库存管理过程中,配送中心只有使库存保持较高的必要水平,才能使储存费用与缺货费用之和最小。 对配送固定成本的控制重点在于对配送系统初始投资的控制。 药物的使用中对重病者可() 小量频服。 一天服二煎。 一次顿服。 隔4小时服一次。 公认的商业道德是判断市场竞争行为正当与否的标准之一。() You are underway and pass by a lighthouse. Its light,which was white since you first sighted it,changes to red. This means().
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