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试验前的准备工作准备工作包括:试料的准备;药剂、设备的准备和工作人员的准备,现分述如下。试料的准备在于从试样中分出供分析用和各种试验用
Preparations for the pre-test preparation include: Preparation of the test sample; preparation of the preparation, preparation of the device and preparation of the staff, are as follows. Preparation of the sample is separated from the sample for analysis and various tests