【单选题】下列关于简谐振动的说法错误的是( )。
A.
简谐振动是指物体运动时所受的力和离开平衡位置的位移成正比,方向相反
D.
只有相同频率的简谐振动才能画在同一个旋转矢量图中
【简答题】Leave Request Form Employee Information Name :1.__________ Employee Number :2.__________ Department :3.__________ Leave Type :4.__________ Starting Date :5.__________ Resumption Date : January 25 th ,...
【判断题】鹿抵易犯错误:身体侧屈幅度不够,眼看不到后脚跟。( )
【单选题】下列关于谐振动的说法错误的是:
B.
一个全振动内不可能存在完全相同的两个振动状态
C.
只要物体的回复力和位移成正比,物体的振动就是谐振动
D.
谐振动动能增加势能必然减少,但总能量始终保持不变
【单选题】下列关于简谐行波的说法错误的是:
B.
不考虑媒质的吸收,平面简谐波和球面简谐波的振幅都不会发生变化
C.
简谐波虽然是简谐振动在媒质中的传播,但传播方向上各质点的振动并不是简谐振动
D.
在无限大均匀各向同性的理想弹性媒质中,平面简谐波的波面是平面,球面简谐波的波面是球面,但如果遇到障碍物,波面的形状就会发生变化
【简答题】Task 3 Reading comprehension. The White House is the most visited residence in the world. Tours may be scheduled through our Washington DC office. Due to security and scheduling procedures, there are ...
【简答题】Fill in each blank with the appropriate form of the word given in the bravkets 1. I'm sure that shipment will be effected according to the contact's_________(stipulate). 2. We have received your______...