【单选题】关于力对点之矩的说法,不正确的是( )
D.
顺时针方向转动时为负,逆时针方向转动时为正。
【单选题】实现时钟信号控制的最简单的方式是采用是()。
【多选题】关于力对点的矩的说法,正确的是()
A.
力对点的矩与力的大小和方向有关,而与矩心位置无关
C.
力的数值为零或力的作用线通过矩心时,力矩均为零
D.
互相平衡的两个力,对同一点之矩的代数和等于零
【简答题】How does the man feel about tasting the soup? a. interested b. scared 2. How do you know? a. His voice rises. b. His voice sounds nervous. 3. How does the man feel after he tastes the soup? a. a...
【判断题】主从 RS 触发器的触发方式是主从触发方式,即 CP 下降沿有效。
【单选题】He got to the cinema at last but ____ he couldn't find his ticket. [ ]
【单选题】社会支持仅在应激条件下与身心健康发生联系指的是()模型。
【简答题】Unfortunately he found he ____________(毫无相同之处) with his twin brother.