XiaoIce likes to write poems and writes every day.
A. Ture.
B. False.
C. Not Mentioned.
查看答案
Sophia is the first robot that shares every equal right with human beings.
A. True.
B. False.
C. Not Mentioned.
平面汇交力系最多可列出的独立平衡方程数为( )。
A. 2
B. 3
C. 4
D. 6
平面任意力系平衡的充要条件是()。
A. 合力为零
B. 合力矩为零
C. 各分力对某坐标轴投影的代数和为零
D. 主失和主矩均为零
若某平面任意力系向某点简化后主矩为零,则其合力()。
A. 一定为零
B. 一定不为零
C. 不一定为零
D. 与主矩相等