用量纲分析法进行结构模型设计时,下列()个量纲不属于基本量纲。
A.力
B.应力
C.长度L
D.时间T
参考答案:B
____ in 1636, Harvard is one of the most famous universities in the United States.[ ]
A. Being founded
B. It was founded
C. Founded
D. Founding
直流小惯量伺服电动机在1s内可承受的最大转距为额定转距的()。
A.2倍
B.3/5
C.10倍
D.1/4