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【简答题】
一质点同时参与两个在同一条直线上的简谐振动,表达式分别为x 1 =5cos(2t+π/6)(cm),x 2 =8cos(2t-5π/6)(cm),则合振动的φ=______,角频率ω=______,振幅A=______。
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参考答案:
举一反三
【单选题】Which is NOT true of bladder cancer? 查看材料
A.
It is the 9th most common cancer worldwide.
B.
It can be identified only by dogs.
C.
It kills more than 100,000 people each year.
D.
It is mainly caused by smoking.
【判断题】“江山易改,本性难移”不全对,因为性格可以调适。
A.
正确
B.
错误
【单选题】前后两船处于追越过程中,发生下列哪种情况不可以免除追越船让路责任()。 1 前船已停车甚至倒车; 2 前船突然显示搁浅信号; 3 在狭水道中,前船已同意追越并采取行动;4前船不履行保向保速义务而进行转向。
A.
B.
①②
C.
①②③
D.
①②③ ④
【简答题】A.It has always been very popular. B.More and more people pay attention to it. C.It is the most important sport in China. D.People don't have any interest in baseball.
【单选题】任何单位和个人需要在依法划定的电力设施保护区内进行可能危及电力设施安全的作业时,应当经( )批准并采取安全措施后,方可进行作业。
A.
电力管理部门
B.
电缆管理部门
C.
电力设施管理部门
D.
安全监督管理部门
【单选题】前后两船处于追越过程中,发生下列哪种情况不可以免除追越船让路责任1前船己停车甚至倒车2前船突然显示搁浅信号3让路船未采取行动4前船不履行保向保速义务而进行转向
A.
B.
①②
C.
①②③
D.
①②③④
【单选题】前后两船处于追越过程中,发生下列哪种情况不可以免除追越船让路责任:() Ⅰ、前船已停车甚至倒车 Ⅱ、前船突然显示搁浅信号 Ⅲ、在狭水道中,前船已同意追越并采取行动 Ⅳ、前船不履行保向保速义务而进行转向
A.
B.
Ⅰ、Ⅱ
C.
Ⅰ、Ⅱ、Ⅲ
D.
Ⅰ、Ⅱ、Ⅲ、Ⅳ
【单选题】What do people think of Women in Love?
A.
It is the best novel written by Lawrence.
B.
It is the most profound novel of Lawrence.
C.
It is one of his masterpieces.
D.
It is a more profoundly ordered novel and is regarded as one of his masterpieces.
【单选题】题干: 前后两船处于追越过程中,发生下列哪种情况不可以免除追越船让路责任: I、前船已停车甚至倒车 II、前船突然显示搁浅信号 III、在狭水道中,前船已同意追越并采取行动 IV、前船不履行保向保速义务而进行转向
A.
B.
Ⅰ、Ⅱ
C.
Ⅰ、Ⅱ、Ⅲ
D.
Ⅰ、Ⅱ、Ⅲ、Ⅳ
【单选题】The teenagers wonder ______ makes Jay a successful pop singer. [     ]
A.
what is it that
B.
what it is that
C.
that it is
D.
what. is it that
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