简述国外馈赠礼仪基本常识。
什么是校正力？
A trade custom has been proved to the effect that in trade between Sarawak and Singapore mate’s receipts（）universally adopted as documents of title as in same way as bills of lading. are。 takes。 makes。 ha。
简述尺蠖鱼蛭病的病状和病理变化。
Centrifugal pumps are popular because they are very simple in construction,and produce smooth, constant, （） discharge. non-pulsating。 pulsating。 positive。 non-positive。
如果企业制定的信用标准较严，只对信誉好坏账损失率低的客户给予赊销，则会（）
