The following is my personal preference in writing: with : 用. The test was performed with a filter. by : 由. The test was carried out by an approved operator. by : 以. The testing was performed by (or by means of) filtration method. (以 filtration method 进行测试)
poorlittle发表:The following is my personal preference in writing: with : 用. The test was performed with a filter. by : 由. The test was carried out by an approved operator. by : 以. The testing was performed by (or by means of) filtration method. (以 filtration method 进行测试)