那末是进入密闭空间，比方反响罐、储料罐或容器、上水道或其它天上弹道、天上设施、农业密闭谷仓、铁路罐车、船运客舱、隧道等作业场合，在人员进入之前，就务必继续检测，而且要在密闭空间外继续检测。 7）形容颗粒粒度散布时应同声写明散布类型和测试原理.如 ...
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