Which vessel when anchored at night，would not be required to show anchor lights? （） ["A vessel engaged in underwater operations","A vessel engaged in mine clearance","A vessel engaged on pilotage duty","A vessel engaged in survey operatio"]
突破的正确读音是（）。 ["とくはつ","とっぱ","とつは","とくぱ"]
EDCs一般是脂溶性物质，分子较小，进入人体后，主要贮存在：（） ["骨组织","肌肉细胞","神经细胞","脂肪细胞"]
在电子商务的安全技术中，实现对原始报文的鉴别和不可抵赖性是（）技术的特点。 ["虚拟专用网","数字签名","认证中心","安全电子交易规范"]
铅酸电池目前被广泛用于限定车速（）的各种场地车上。 ["等于50Km\/h","大于50Km\/h","小于50Km\/h","小于60Km\/h"]
简述茎双穴吸虫病的流行情况。
