题目内容

D/A

A. 付款交单
B. 承况交单
C. 装运交单

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A:We are pleased to 1 with your about 2 . What would you say to 3 ?B: I'm afraind that it won't do. I has been our 4to require payment by confirmed, 5 and sight L/C.A: But i know sometimes you accept D/P, don't you? 6 causes us a lot of expenses because it requires a certain sum of deposit in the bank.B: Yes, we do accept D/P, which is only for 7 and small amount 8 the deals. This is not the case with you.A: I understand payment by L/C provides guarantee to both the sellers and the buyers. Considerin the large amount, is a time L/C, say 9 , acceptable? You see, we are making a concession. You should leave us some time to 10 .

Please find the best match for the following Engish expression.

免疫球蛋白基因重排不会在上皮细胞中发生是因为

A. 上皮细胞中没有免疫球蛋白基因
B. 上皮细胞中没有RSS序列
C. 上皮细胞中不表达RAG酶
D. 上皮细胞不会发生等位排斥

下列那些事件不是免疫球蛋白多样性产生的基础

A. 编码序列存在多种基因片段
B. P核苷酸和N核苷酸的插入
C. 不同重链和轻链的组合
D. 等位排斥

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