We__fight against pollution.A.may B.should c.mustn't D.needn't

We__fight against pollution.A.may B.should c.mustn't D.needn't 13046 ...please bill 60pcs against PO #901-100013 and 120pcs against PO #901-100018 求翻译 求英文翻译：please bill 60pcs against PO #901-101 and 120pcs against PO #90,这里的AGAINST什么意思 po po against against 外贸：the payment mode we will transfer to you 30% with our po then other 70% against delivery paper翻译? 英语翻译Request you to confirm giving the same against our PO confirmation so that we can initiate action at our end. po是什么 po是什么意思 水泥PO, 什么是PO? po是什么? PO是什么意思 po是什么意思 po NO CUSTOMER PO#