未知类型：{'options': ['', '', '', '', ''], 'type': 102}
举一反三
- 0Hz and an amplitude of8.0cm.<br/>If a timer is started when its displacement is a maximum (hence x=8cm<br/>when t=0),<br/>what isthe<br/>displacement of the mass when t=3.7s? A: zero B: 0.025<br/>m C: 0.036<br/>m D: 0.080<br/>m E: 0.095<br/>m
- I really don't know ______. A: when started B: when to start C: when start
- 一质点在x轴上作简谐振动，振幅A = 4 cm，周期T = 2 s，其平衡位置取作坐标原点。若t = 0时刻质点第一次通过x = -2 cm处，且向x轴负方向运动，则质点第二次通过x = -2 cm处的时刻为 未知类型：{'options': ['1', ' [img=11x33]17da3e8f790cd5e.jpg[/img]', ' [img=11x33]17da3fa7159a83d.jpg[/img]', ' 2'], 'type': 102}
- For a certain ground motion, if its peak ground motion acceleration is 10.0, then Sa(0), the value of its response spectrum at T =0 is? A: 1.0 B: 10.0 C: 0.0 D: 2.25
- I couldn’t understand what my classmates were saying when I first started school.
内容
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中国大学MOOC: A uniform circular motion on xoy plane can be treated as the superposition of a simple harmonic motion in x direction and another simple harmonic motion in y direction.
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已知某简谐振动的振动曲线如图所示，位移的单位为厘米，时间单位为秒．则此简谐振动的振动方程为： [img=261x166]18032de3523df2c.png[/img] A: x＝２ｃｏｓ（４πｔ／３＋２π／３）ｃｍ B: x＝２ｃｏｓ（２πｔ／３＋２π／３）ｃｍ C: x＝２ｃｏｓ（２πｔ／３－２π／３）ｃｍ D: x＝２ｃｏｓ（４πｔ／３－２π／３）ｃｍ E: x＝２ｃｏｓ（４πｔ／３－π／４）ｃｍ
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He didn't tell us [u] [/u][u] [/u]. 未知类型：{'label': 'questionDesc', 'content': '请选择正确答案。', 'isMemberControl': 0, 'type': 181} A: if he will give us a lecture B: whether he would go with you C: when he was started D: when he will arrive
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What information shouldn’t include when informing someone’s of the minute of a meeting?
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Under what condition do people get frustrated when reading other people's business cards?When they can't _____ the information they need.