执行语句Open"Sample.dat" For Random As #1 Len = 50 后,对文件"Sample.dat"中的数据能够进行的操作是

Counter sample can also be called ( ) A: duplicate sample B: sealed sample C: return sample D: reference sample

Counter<br/>sample can also be called _____________.() A: duplicate<br/>sample B: sealed<br/>sample C: confirmed<br/>sample D: contracted<br/>sample

The sample made by the seller according to the buyer’s, and then sent to and confirmed by the buyer is called __________. A: duplicate sample B: returning sample C: original sample D: copy sample

In international trade, according to supplier of the sample, sales by sample can be divided into A: Sales by Seller’s Sample B: Sales by Buyer’s Sample C: Sales by Counter Sample D: Sale by Descriptions or Illustrations E: Sales by Reference Sample

Which are the common used ways to sampling? A: Simple random sample without replacement B: Simple random sample with replacement C: Stratified sample D: Cluster sample

23. Sale by sample includes sale by seller’s sample, sale by buyer’s sample and sale by duplicate sample.

In “ sale by the seller’s sample”, _______ sample is ultimately in the hand of the seller.

删除D盘根目录中所有DAT文件的命令是_____。 A: Kill "*.DAT" B: Kill "D:\*.DAT" C: Kill " D:\?.DAT" D: Kill D:\*.DAT

Absorption is related to ( ). A: the structure of the sample B: the concentration of the sample C: the length of light path through the sample D: amount of the solution