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From the import’s point of view, the ideal arrangement is to draw a sight draft under a documentary credit, and to receive payment of it immediately upon presentation.（）

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To ensure security of electronic commerce,an electronic certification center should be established.DTo ensure security of electronic commerce,an electronic certification center should be established.Digital ID is trusted to validate identity.Digital ID is trusted to a third party,namely,an authorized agency,to release,including identifying information of the holder（）,an inscriptive key for common use by the both parties,period of validity,password and identification information of the authorized agency,etc.Wjth digital ID,both parties in transactions can be assured of identifying the other party and validate that the information sent out from the other party has not been subject to alteration.

By the 1950s, the wireless had become an established feature of every home.（）

When we draw views of composite solids, the views of the each feature should be drawn first, and then the datum lines.（）

数控与普通数控的区别是在数控装置部分引入了一台小型通用计算机。数控与普通数控的区别是在数控装置部分引入了一台小型通用计算机。