【简答题】关于力偶,下面哪种说法是不正确的( ) A.力矩在任一轴上的投影均为零 B.力矩可以被一个力平衡 C.力矩与矩心位置有关 D.力矩无合力
【单选题】The ___ control fuel flow to the engines.
C.
engine fuel spar valves
【单选题】In the VISCOCHIEF fuel oil viscosity control system, the output signal of the viscometer is ______.
A.
the pressure difference value
【单选题】In the NAKAKITA fuel oil viscosity control system,the output signal of the viscometer is ____.
A.
The pressure difference value
【简答题】请写一个程序打印出 0~100 所有的奇数。
【多选题】关于力矩有以下几种说法,正确的有:
A.
对某个定轴转动的刚体而言,内力矩不会改变刚体的角加速度
B.
一对作用力与反作用力对同一轴的力力矩之和必为0
C.
质量相等,形状和大小不同的两个刚体,在相同力矩的作用下,它们的运动状态一定相同
D.
如果一个刚体所受合外力为0,则合外力矩也一定为0.
【判断题】Both the Fuel-optimal control problem and the time-optimal problem are the control-constrained optimal problems with the variable terminal time.
【单选题】In the VISCOCHIEF fuel oil viscosity control system, the output signal of the viscometer is ______, and the relation between the signal and fuel viscosity is ______.
A.
pressure / direct proportion
B.
pressure / inverse proportion
C.
induction EMF / direct proportion
D.
induction EMF / inverse proportion