患者口角湿白，唇裂，鼻唇沟及眉间脂溢性皮炎，阴囊红肿，有溢出液，并有怕光、流泪、舌痛最可能为缺乏（）。
A. 维生素B1
B. 核黄素
C. 尼克酸
D. 维生素A
查看答案
A towing vessel is tripped when（）.
A. it is overtaken by the tow
B. it is pulled sideways by the tow
C. the weight of the towing hawser causes loss of maneuverability
D. the propeller is fouled by the towing hawser
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