Which of the following is not a credit instrument？（）

A:Check B:promissory note C:draft D:coin

混凝土配制强度f_cu,0与设计强度f_cu,k的关系是( )。

A:f_cu,0=f_cu,k-tσ(t＜0) B:f_cu,0=f_cu,k+tσ(f＜0) C:f_cu,0=f_cu,k D:f_cu,0＜f_cu,k

混凝土配制强度f_cu，0与设计强度f_cu，k的关系是( )。

A:f_cu，0=f_cu，k-tσ(t＜0) B:f_cu，0=f_cu，k+tσ(t＜0) C:f_cu，0=f_cu，k D:f_cu，0cu，k

B 　　A world-famous Canadian author, Margaret Atwood, has created the world’s first long-distance signing device(装置), the LongPen. 　　After many tiring……from city to city, Atwood thought there must be a better way to do them . She hired some technical experts and started her own company in 2004. Together they designed the LongPen. Here’s how it works: The author writes a personal message and signature on a computer tablet(手写板) using a special pen. On the receiving end, in another city, a robotic arm fitted with a regular pen signs the book. The author and fan can talk with each other via webcams(网络摄像机) and computer screens。 　　Work on the LongPen began in Atwood’s basement(地下室). At first, they had no idea it would be as hard as it turned out to be. The device went through several versions, including one that actually had smoke coming out of it. The investing finally completed, teat runs w ere made in Ottawa, and the LongPen was officially launched at the 2006 London Book Fair. From here , Atwood conducted two transatlantic book signings of her latest book for fans in Toronto and New York City. 　　The LongPen produces a unique signature each time because it copies the movement of the author in real time. It has several other potential applications. It could increase credit card security and allow people to sign contracts from another province. The video exchange between signer and receiver can be recorded on DVD for proof when legal documents are used. 　　“It’s really fun”, said the owner of a bookstore, who was present for one of the test runs. “Obviously you can’t shake hands with the author but there are chances for a connection that you don’t get from a regular book signing.. 　　The response to the invention has not been all favorable. Atwood has received criticism from authors who think she is trying to end book tours. But she said, “It will be possible to go to places that you never got sent to before because the publishers couldn’t afford it.”How could the LongPen be used in the future

A:To draft legal documents. B:To improve credit card security C:To keep a record of the author’s ideas. D:To allow author and fan to exchange videos

Document credit means payment against( )instead of against goods.

A:contracts B:documents C:cargoes D:bank draft

英译汉：“documentary credit；documentary draft；duplicate”，正确的翻译为（）

A:跟单汇票；跟单信用证；复本 B:跟单信用证；跟单汇票；复本 C:跟单信用证；复本；跟单汇票 D:复本；跟单汇票；跟单信用证

英译汉：“documentary credit；documentary draft；duplicate'’，正确的翻译为：( )。

A:跟单汇票；跟单信用证；复本 B:跟单信用证；跟单汇票；复本 C:跟单信用证；复本；跟单汇票 D:复本；跟单汇票；跟单信用证