Before any portable gas indicators are brought to the measuring spot, what is very important to do with these analysers first?

题库:船长 类型:最佳选择题 时间:2019-02-14 17:22:46 免费下载:《甲类船长英语考证》Word试卷

Before any portable gas indicators are brought to the measuring spot, what is very important to do with these analysers first?
A.To do a full calibration
B.Just renew the batteries
C.Zero adjust them
D.Just check the filters

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