单词	十亿分之一（10-9）
释义	十亿分之一（10-9）nano-
随便看	operating plan after accident operating point operating policy operating policy guide operating policy guide{=opg} operating position operating--position operating power operating pravtice operating pressure operating pressure angle operating pressure-- working pressure operating pressure; working pressure operating principle operating principle of safety operating principle of unitization operating procedure operating procedure of nuclear power plant operating process analysis operating process chart operating produce operating profile operating profit operating program operating program tape