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【单选题】
以下关于信息光学中空间频谱的说法正确的是A.
时间频率，电流电压等周期性信号的周期的倒数
B.
属于光谱，由光波的波长决定
C.
有利于在三维空间描述光波的行为
D.
光波场空间周期的倒数，空间频率，代表不同方向的平面波
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【简答题】Newton's second law says: the acceleration of an object is directly proportional to the net force acting on it and is inversely proportional to its ________. (one word)
【判断题】Newton's Second Law is that the net force applied on an object will result in change of linear momentum , and equals to the first order differentiation of the linear momentum to time, that is .
A.
正确
B.
错误
【判断题】运动方程的基础是牛顿第二定律。The basis of the equation of motion is Newton's second law.
A.
正确
B.
错误
【单选题】某些护士留短发。因此，某些留短发的人穿白衣服。下列哪项如果是真，足以佐证以上论述的正确性？（ ）
A.
某些护士不穿白衣服
B.
某些穿白衣服的护士不留短发
C.
所有护士都穿白衣服
D.
某些护士不喜欢留短发
【判断题】Newton's Second Law in angular form is that the net torque applied on a particle is the reason for changing angular momentum l of the particle, and is given by .
A.
正确
B.
错误
【单选题】The continuity equation
A.
requires that Newton's second law of motion be satisfied at every point in the fluid
B.
expresses the relation between energy and work
C.
states that the velocity at a boundary must be zero relative to the boundary for a real fluid
D.
relates the momentum per unit volume for two points on a streamline
E.
relates mass rate of flow along a stream tube
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