单项选择题
A．Certificate of empty tank；Certificate of fumigation B．Certificate of fumigation；Certificate of cleanliness C．Certificate of empty tank；Certificate of cleanliness D．Certificate of cleanliness；Certificate of empty tank
A．CCC标志 B．强制性产品认证 C．安全标志 D．检验检疫标志
A．so B．A C．Such D．/