⑴____What are these?
⑵____Is there an apple on the table?
⑶____How many bikes are there ?
⑷____Can you drive a car?
⑸____What's the weather like in spring?
A: There're five.
B: It's warm.
C: They're pears.
D: Yes, there is.
E: No, I can't.
Miss. White: What's your name?
John: ____________
在水平方向上做简谐运动的质点,其振动图像如图所示。假设向右的方向为正方向,则物体的位移向左且速度向右的时间段是( )
有一种观点认为:“自由不在于幻想中摆脱自然规律而独立,而在于认识这些规律,从而能够有计划地使自然规律为一定的目的服务”。还有一种观点认为,“自由倒过来就是由自,因此自由等于由自,由自就是随心所欲。”这两种关于“自由”的观点( )