单交

First, a chlorinator was self-designed in this paper, and dichloride of 2-methyl-1-propene was synthesized by 2-methyl-1-propene reacted with chlorine fast in this reactor. By means of the Orthogonal Experiments design and single factor experiments, the influence of several reaction variables on the yield were examined and the optimum reaction conditions under the intervallic operation were obtained, the yield and selectivity of dichloride of 2-methyl-1-prop-ene were more than 65% and 80% respectively. Second, the preparation of 2-methylene-1, 3-propanediol, which dichloride of 2-methyl-1-propene reacted with alkali was investigated. By means of the Orthogonal Experiments design and single factor experiments, the influence of several reaction variables on the yield were examined and the optimum reaction conditions under the intervallic operation were obtained, the conversion of dichloride of 2-methyl-1-propene was 100%. Moreover the preparation of MPO, which 2-methylene-1, 3-propanediol reacted with hydrogen, in presence of Al_2O_3-Pd catalyst, was gotten, and the product was appraised.

本文在氯化反应过程中，自行设计制作出了氯化管式反应器，在该反应器中异丁烯和氯气迅速混合反应生成二氯异丁烯，根据该氯化反应特征利用正交试验和单因素试验考察了有关因素的影响并优化得到了最佳工艺条件，二氯异丁烯的总收率达65％以上，选择性达80％；接着，对二氯异丁烯进行水解反应制得了2-甲烯-1，3-丙二醇，讨论了相关因素对水解反应的影响，并通过正交试验和单因素试验得到了较佳工艺条件，二氯异丁烯的转化率达100％；同时还对制备的2-甲烯-1，3-丙二醇在常压下采用三氧化二铝负载钯催化剂催化加氢得目的产物MPO，并对产品进行了鉴定，从而打通了整个工艺路线。

So it's better for us to adopt DP or DA.

因此，最好是采用付款交单方式或承兑交单方式。

Of invoice ononononvalue is to be paid by confirmed and irrevocable L/C available by clean draft at sight, established in our favour, to reach us not later than 30 days before the month of shipment and the balance 50% is to be paid against documents immediately upon presentation (documentary draft at 30 days sight ).

12发票金额的50%以保兑的、不可撤销的信用证，凭光票即期付款，信用证须于装运月前30天开达我方，金额50%即期付款交单（或见票30天内付款交单），发票全部金额的装运单据仅限第二个50%付讫后方能交割，该50%的金额如遭拒付时，我们保留自行处理货物之权。

Of invoice on on on onvalue is to be paid by confirmed and irrevocable L/C available by clean draft at sight, established in our favour, to reach us not later than 30 days before the month of shipment and the balance 50% is to be paid against documents immediately upon presentation (documentary draft at 30 days sight ).

12发票金额的50%以保兑的、不可撤销的信用证，凭光票即期付款，信用证须于装运月前30天开达我方，金额50%即期付款交单（或见票30天内付款交单），发票全部金额的装运单据仅限第二个50%付讫后方能交割，该50%的金额如遭拒付时，我们保留自行处理货物之权。

Q/ }* s5 C4 ?3 Z5 T 50% of invoice ononononvalue is to be paid by confirmed and irrevocable L/C available by clean draft at sight, established in our favour, to reach us not later than 30 days before the month of shipment and the balance 50% is to be paid against documents immediately upon presentation (documentary draft at 30 days sight ).

12发票金额的50%以保兑的、不可撤销的信用证，凭光票即期付款，信用证须于装运月前30天开达我方，金额50%即期付款交单（或见票30天内付款交单），发票全部金额的装运单据仅限第二个50%付讫后方能交割，该50%的金额如遭拒付时，我们保留自行处理货物之权。

Pingbianensis flowers were ants (Aphaenogaster smythiesii Forel,Formicidea), springtail (Hypogastrura sp., Hypogastruridae, Collembola) and one species of beetles (Anomala corpulenta Motsch, Rutelidae). These pollinators generally have restricted movement capacities and hence promote geitonogamy or mating between individuals in close proximity within populations. The results of out crossing index pollination experiments in our study suggest that T. pingbianensis has an animal-pollinated, mixed selfing and outcrossing breeding systems.

通过对屏边开口箭的开花物候、传粉生物学、交配系统的研究以及对近交衰退的检测，结果显示：屏边开口箭单花花期约15天左右，柱头、花粉活力持续时间较长；传粉昆虫多为蚂蚁、跳虫，偶有小甲虫拜访，缺乏长距离传粉昆虫；杂交指数以及套袋试验的结果表明屏边开口箭为高度自交亲和的混交模式植物，且在幼苗早期并没有表现出明显的近交衰退现象。

A note payable on demand.Yc 20th/may regret d/a unacceptable suggest exceptionally d/pistil plscable acceptance.

你方5月20日电悉承兑交单歉难接受建议以特殊优惠的见票即付付款交单请电告接受。

I believe that. But an irrevocable L/C gives the seller the extra protection of the banker's guarantee while under D/P or D/A system, there is no guarantee for payment.

赵：我相信这一点，但是不可撤消的使用证这种支付方式能向卖方提供额外的银行保证，而付款交单和承兑交单都不能予以这种保证。

Documents Against Acceptance means that the title documents will be handed over to the buyer once the buyer has accepted the usance draft drawn by the seller.

承兑交单是指出口人的交单以进口人在卖方开出的远期汇票上承兑为条件的支付方式。

In the second part of the thesis, the pseudo kinetic constant method was used inmodeling vinyl/divinyl cross-linking atom transfer radical polymerization.

对于双烯／单烯的ATRP交联聚合反应，应用拟动力学常数的方法，推导出了双烯／单烯ATRP交联聚合的普适矩方程模型。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。