单项选择题
A．Certificate of quality；Certificate of fumigation B．Certificate of quality；Certificate of disinfection C．Certificate of quantity；Certificate of fumigation D．Certificate of quantity；Certificate of disinfection
A．即期付款；货到付款；凭汇票付款 B．凭汇票付款；即期付款；货到付款 C．货到付款；凭汇票付款；即期付款 D．货到付款；即期付款；凭汇票付款
A．电话形式 B．传真形式 C．书面形式 D．电子邮件形式