皮皮学，免费搜题
登录
搜题
【单选题】
客运管理是对乘客运送过程的管理,是直接面向 () 的重要服务系统。A.
乘客
B.
服务人员
C.
游客
D.
参观者
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【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
【简答题】Terry Mason
【简答题】The author indicated that Mason’S brilliant leadership ability ．
【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
【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
【简答题】The passage indicates that，for Mason，politieaI activities were ．
【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
【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．
【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
相关题目：