L／C(Letter of Credit)

1、We have received your letter of Septem

We have received your letter of September 12，（）we are glad to know that you are interested in our electric heaters.AwhichBat whichCfrom whichDin which

2、We have received your letter of Septem

We have received your letter of September 12，（）we are glad to know that you are interested in our electric heaters.AwhichBatwhichCfromwhichDinwhich

3、Sweating of the refrigeration system c

Sweating of the refrigeration system compressor crankcase is caused by （）.Atoo much superheatBinsufficient superheatCsuction pressure too lowDexcessive refrigerant returning to the compressor

4、all of the following are function of c

all of the following are function of crm system except （）AA、automation procurementBB、automation salesCC、automation marketingDD、automation customer service

5、We（）your letter of Nov. 3 asking us to

We（）your letter of Nov. 3 asking us to make a quotation.AgooverBhavereadCrefertoDcheckup

6、We thank you for your letter of May 17

We thank you for your letter of May 17 and the（）catalogue.AsentBenclosedCgivenDpresented