单项选择题
A．deeply as B．as deed as C．so deep as D．so deeply as
A．purchase order；commercial invoice B．commercial invoice；purchase order C．commercial invoice；proforma invoice D．proforma invoice；purchase order
A．divisible L/C；sight L/C B．sight L/C；divisible L/C C．divisible L/C：irrevocable L/C D．irrevocable L/C；divisible L/C