皮皮学，免费搜题
登录
搜题
【单选题】
粉花绣线菊的有缺刻状重锯齿,叶背A.
灰白色
B.
灰绿色
C.
粉红色
D.
紫色
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
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】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
相关题目：