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【单选题】
螺纹的基本要素包括( )、螺纹大径、线数、螺距和导程、精度、旋向。A.
牙型
B.
C.
线形
D.
代号
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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)
【简答题】translate newton's second law
【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
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