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【多选题】
( 多选 ) 单摆是为研究振动而抽象出的理想化模型,其理想化条件是 ( ) A .摆线质量不计 B .摆线不可伸缩 C .摆球的直径比摆线长度小得多 D .只要是单摆的运动就一定是简谐运动
A.
1
B.
2
C.
3
D.
4
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Some pessimistic experts feel that the automobile is bound to fall into disuse. They see a day in the not-mo-distant future when all autos will be abandoned and allowed to rust. Other authorities, how...
A.
keep in the right lane
B.
wait to arrive at his destination
C.
keep in constant touch with the computer center
D.
inform the system of his destination by phone