The -f operator returns true only if the file exists.
只有在文件存在时，- f操作符才返回true。
Pilots have guided the F-35 cockpit design process from the very beginning to ensure the fighter's front office is an efficient workspace that liberates the operator from unwanted distractions.
飞行员从F-35的座舱设计的最初阶段就参与其中了，以确保战斗机的正前方工作区成为一个有效的工作平台来将操作人员从无谓的分神中解放出来。
In order to reconstruct the shape of scatterer d, we establish the relation between the scatterer and the far field pattern. The relation can be fixed by so called far field operator f.
为了能够重构散射体d，我们可以建立起远场模与散射体之间的联系，这种联系可以通过所谓的远场算子f来确定。
In this paper, we mainly discuss the fixed point theorems of monotone mappings and the solvability of a class of nonlinear operator equations in partially ordered F-type topological Spaces.
本文主要研究半序f -型拓扑空间中单调映射的不动点定理和一类非线性算子方程的可解性。
Then T is an invertible linear operator preserving rank - partial ordering on Sn(F) if and only if there exists an invertible matrix (F) such that where .
刻画了在非负无零因子交换半环上强保持可逆矩阵的线性算子。
Then T is an invertible linear operator preserving rank - partial ordering on Sn(F) if and only if there exists an invertible matrix (F) such that where .
刻画了在非负无零因子交换半环上强保持可逆矩阵的线性算子。
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