... Director General 总干事(国际原子能机构) direct or reverse 正向或反向的，正面或反面的 director's office 厂长室 ...
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Direct or reverse acting 正反作用
direct or reverse circulation 正反循环
It is believed that priority is given to reverse direction drive in the case that it may be driven in ether direct or reverse direction, especially under large water flushing conditions.
并认为在斜井既可正掘又可反掘的条件下，尤其是在涌水量较大的情况下应优先考虑反掘方案。
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