信用证是一项独立的文件，即信用证一经开立，就成为独立于贸易合同以外的一项契约()。
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Which ofthe following is TRUE concerning a Single Composition Spherical alloy()
Achieves hi ghearly strength
B. Requires more mercury
C. Provides fighter interproximal contacts
D. Requires as small a condenser as possible
Triturating a lathe-cut amalgam at too high a frequency call()
A. make it adapt beaer to the margins of the preparation
B. reduce the amount of mercury it gives off
C. increase its working time
D. reduce its working time
委托人提交的航空运单、邮包收据起不到控制买方付款或承兑的作用()。
使用融通汇票贴现对进口商融资中，远期融通汇票的承兑人是进口商()。
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