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【单选题】
—Why has he been so upset? —He didn’t leave the things _____ they belonged, for _____ he was scolded by his parents.
A.
which; that
B.
which; this
C.
where; whose
D.
where; which
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【单选题】以树皮入药的药材的采集时间为
A.
清明至夏至间
B.
春、秋时期
C.
果实将成熟或已成熟时
D.
花蕾将开放或正盛开时
E.
植株充分生长、枝叶茂盛时期
查看完整题目与答案
【多选题】频率相近的两个同方向的简谐振动合成后,会产生拍现象,拍现象的特征为( )
A.
合振动是简谐振动
B.
合振动不是简谐振动
C.
合振动的振幅随时间做缓慢的周期性的变化
D.
合振动的振幅随空间做缓慢的周期性的变化
E.
合振动的振幅不随时间、空间变化
F.
合振动振幅变化的频率为拍频
G.
拍频等于两个简谐振动的频率之差的绝对值
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【简答题】Terry Mason
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【单选题】The author seems to be especially impressed by the fact that ______.
A.
Mason, a responsible citizen, resisted for so long the obligation to represent his state in politics
B.
Mason, having so little political inclination, turned out to be such an influential statesman
C.
Mason was willing to leave home and family for public service
D.
Mason could be a devoted family man and a statesman at the same time
查看完整题目与答案
【单选题】设两个同方向简谐振动，二者振幅相同，初相也相同，周期分别为T1、T2，频率分别为ν1、ν2，【图片】，则这两个振动的合振动：
A.
合振动仍然为简谐振动，其频率为
B.
合振动仍然为简谐振动，其周期为
C.
合振动形成拍，拍的频率为
D.
合振动形成拍，拍的周期为
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【单选题】The author seems to be especially impressed by the fact that ______. ( )
A.
Mason, a responsible citizen, resisted for so long the obligation to represent his state in politics
B.
Mason, having so little political inclination, turned out to be such an influential statesman
C.
Mason was willing to leave home and family for public service
D.
Mason could be devoted family man and a statesman at the same time
查看完整题目与答案
【单选题】两个同频率同方向的简谐振动,周期为20ms,振幅分别为1cm和3cm,当两者相位差为0时,合振动的振幅是:
A.
2cm
B.
3.2cm
C.
3.6cm
D.
4cm
查看完整题目与答案
【单选题】图中(1)和(2)表示两个同方向,同频率的简谐振动的振动曲线。则(1)和(2)合成振动的振幅为 ,初位相为 ,周期为 .
A.
2cm, ,       2.4s
B.
1cm, ,        12s
C.
1cm, ,       12s
D.
2cm, ,      12s
E.
2cm, ,     2.4s
查看完整题目与答案
【简答题】当两个同方向的简谐振动合成为一个振动时，其振动表式为x=Acos2.1tcos50.0t，式中t以s为单位，求各分振动的角频率和合振动的拍的周期．
查看完整题目与答案
【单选题】The whole room fell into an ________ silence and we knew that he would soon explode with anger.
A.
miraculous
B.
unbearable
C.
unlucky
D.
ominous
查看完整题目与答案
相关题目：
【单选题】以树皮入药的药材的采集时间为
A.
清明至夏至间
B.
春、秋时期
C.
果实将成熟或已成熟时
D.
花蕾将开放或正盛开时
E.
植株充分生长、枝叶茂盛时期
查看完整题目与答案
【多选题】频率相近的两个同方向的简谐振动合成后,会产生拍现象,拍现象的特征为( )
A.
合振动是简谐振动
B.
合振动不是简谐振动
C.
合振动的振幅随时间做缓慢的周期性的变化
D.
合振动的振幅随空间做缓慢的周期性的变化
E.
合振动的振幅不随时间、空间变化
F.
合振动振幅变化的频率为拍频
G.
拍频等于两个简谐振动的频率之差的绝对值
查看完整题目与答案
【简答题】Terry Mason
查看完整题目与答案
【单选题】The author seems to be especially impressed by the fact that ______.
A.
Mason, a responsible citizen, resisted for so long the obligation to represent his state in politics
B.
Mason, having so little political inclination, turned out to be such an influential statesman
C.
Mason was willing to leave home and family for public service
D.
Mason could be a devoted family man and a statesman at the same time
查看完整题目与答案
【单选题】设两个同方向简谐振动，二者振幅相同，初相也相同，周期分别为T1、T2，频率分别为ν1、ν2，【图片】，则这两个振动的合振动：
A.
合振动仍然为简谐振动，其频率为
B.
合振动仍然为简谐振动，其周期为
C.
合振动形成拍，拍的频率为
D.
合振动形成拍，拍的周期为
查看完整题目与答案
【单选题】The author seems to be especially impressed by the fact that ______. ( )
A.
Mason, a responsible citizen, resisted for so long the obligation to represent his state in politics
B.
Mason, having so little political inclination, turned out to be such an influential statesman
C.
Mason was willing to leave home and family for public service
D.
Mason could be devoted family man and a statesman at the same time
查看完整题目与答案
【单选题】两个同频率同方向的简谐振动,周期为20ms,振幅分别为1cm和3cm,当两者相位差为0时,合振动的振幅是:
A.
2cm
B.
3.2cm
C.
3.6cm
D.
4cm
查看完整题目与答案
【单选题】图中(1)和(2)表示两个同方向,同频率的简谐振动的振动曲线。则(1)和(2)合成振动的振幅为 ,初位相为 ,周期为 .
A.
2cm, ,       2.4s
B.
1cm, ,        12s
C.
1cm, ,       12s
D.
2cm, ,      12s
E.
2cm, ,     2.4s
查看完整题目与答案
【简答题】当两个同方向的简谐振动合成为一个振动时，其振动表式为x=Acos2.1tcos50.0t，式中t以s为单位，求各分振动的角频率和合振动的拍的周期．
查看完整题目与答案
【单选题】The whole room fell into an ________ silence and we knew that he would soon explode with anger.
A.
miraculous
B.
unbearable
C.
unlucky
D.
ominous
查看完整题目与答案