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某力在直角坐标系的投影为: Fx=3 kN,Fy=4 kN,此力的大小是 ( ) 。

A、5 kN

B、6 kN

C、7 kN

D、8 kN

时间：2021-09-01 19:20 关键词：青书学堂河北建筑工程学院建筑力学（高起专）桂林理工大学建筑工程技术高起专建筑力学基础

答案解析

A

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