在这里，他们试验的是按需印刷，在订购之前人们可以先阅读电子书。
What they are experimenting with here is on-demand printing, where people pre-read an e-book before placing an order.
供货方在交货时应向订购方提供至少二份完整的钢管质量合格证书和试验数据报告，要求按SA688/SA688M S3的规定。
The supplier shall furnish at least two complete U-tube Quality Certificate and Test Data Reports according to the requirements of SA688/SA688M S3.
必须对那些过去没有采购记录的供应商进行样品检查和小部分订购试验。
Inspection of samples and trial orders of small quantities might be used with suppliers for whom there is no previous purchasing record.
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