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【多选题】
交换型以太网可以( )A.
不受CSMA/CD的约束
B.
增加带宽
C.
提高系统的安全性
D.
延长距离
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举一反三
【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
【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
【单选题】For vector addition, you have to use ______ law.
A.
Newton's Second
B.
the arithmetic
C.
Pascal's
D.
the parallelogram
【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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