【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】I’m sure that shipment will be effected according to the contract’s (stipulate). 2. We have received your (remit) in settlement of our claim. 3. 500...
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【简答题】Conversation One (Questions 1-4) Look at the form below. You will hear a man a request for catering. EXECUTIVE CATERING SERVICES BOOKING FORM Date: (2) ..........................................
【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
【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______...